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A car went up a hill at 10 kilometers per hour and down the same distance at 20 kilometers per hour. what was the average speed?
Wiki User
∙ 13y ago
Take a suitable distance, for example 20 kilometers. (The result is the same for any distance; you can also use a distance "x" - this will cancel in the end.)
At 20 km, it will take 2 hours to go up, and 1 hour to go down. This means it takes a total of 3 hours to move 40 km - an average speed of 13.33 km/hour.
Note that the slower speed affects the result more than the higher speed, because the car goes longer at this slower speed!
Wiki User
∙ 13y ago
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How do you calculate the speed of something going down a hill?
Average speed = Distance travelled/Time taken. And that applies whether the object is going downhill, uphill or is on a roller coaster.
A car traveled 80 km in 2 hours What was its average speed in km per hour?
maybe, you should get off wiki answers, and figure it out. lets see, you need to divide it down to km/pH. 80 kilometers = 2 hours, 40 kilometers in 1 hour. average speed? 40 km. that's saying they don't stop anywhere.
Suppose you walked 10miles down a hallway in 2.5seconds. What is your average speed?
10 miles is 10*1.6 = 16 kmYour ave. speed is distance/time = 16/2.5 = 6.4 km/s or 23,040 km/h or 14,400 mphAnyway who the hell walks at a speed of Mach 19???
Why do you have to multiply the average speed of a ball going down a ramp by 2 in order to find its final speed?
The last moment, the speed is the final, the first moment, the speed is zero, average=final /2. For the bit just before the final, and the bit an equal bit just after the start the average is again final/2. For every instant before the final, coupled with the same instant after the start, the average is final/2. So the average for the whole trip is final/2. So to get the final, multiply the average by 2.
A plane traveling at 80ms lands on a runway and comes to rest after 10 seconds what was the distance it traveled down the runway before it stopped?
Original Answer: 400 m/sThis answer is a speed, not a distance.You cannot determine what the distance traveled was since the speed is presumably decreasing for the entire manoeuvre. The best you could do is estimate the distance to be 400 metres. There is insufficient information to do otherwise.For example, if the plane touched down at a speed of 80m/s and didn't change speed until it ran into a wall 10 seconds later, it would have travelled 800m. Of course that would be "coming to a FINAL rest"... :-)
A car goes down a 100Cm ramp in 4 seconds what is the average speed of the car?
distance divided by time equals speed.
How long does it take to drive 0.34 miles?
Average Speed = (distance traveled) / (total time), Total time = (distance traveled) / (average speed). So, to calculate time taken, you need to know the speed and the distance. Note that average speed is a quantity that is normally calculated based on the distance traveled and the time taken. If you slow down and speed up, these factors affect your average speed over a given distance. But if you were already traveling at a given speed and stay constant (say you're on a flat straight road and you're traveling at 50 miles per hour with the cruise control set), then your average speed would be that constant speed. So, in the example, if you were going 50 MPH, then: Total time = (distance traveled) / (average speed) = 0.34 miles / (50 miles/hour) = 0.0068 hr = 0.408 minutes = 24.48 seconds (note this is only for the example speed of 50 MPH - plug in your own speed to obtain the result that you are looking for)
How do you calculate the speed of something going down a hill?
Average speed = Distance travelled/Time taken. And that applies whether the object is going downhill, uphill or is on a roller coaster.
What is an experiment you could perform to determine the average speed of a toy car rolling down an incline?
Simple physics, Velocity(Speed)=Distance traveled / Time taken so measure a set distance down your incline and time the toy rolling down if you want a true speed make sure the toy is going at full speed before it crosses the start line and you start your timer, otherwise you will get an average including the toys acceleration time and as such won't be a true representation
A car traveled 80 km in 2 hours What was its average speed in km per hour?
maybe, you should get off wiki answers, and figure it out. lets see, you need to divide it down to km/pH. 80 kilometers = 2 hours, 40 kilometers in 1 hour. average speed? 40 km. that's saying they don't stop anywhere.
If a car travels 840km between Mackay and Port Douglas at an average speed of 70km/h, how long will the trip take?
Remember the 'speed' equation speed = distance / time Algebraically rearrange time = distance / speed Substitute the numbers . time = 840 km / 70 kmhr^.-1 Divide the number and cancel down the 'km'. time = 12 hrs.
Does light speed up or down when traveling from air into glass?
The speed of light is always the same: 300,000 kilometers per second.
What is the distance after a speed limit sign before the speed limit is enforced?
In the UK the speed limit comes into force as soon as you pass the speed limit sign. As such the distance is zero as you should have slowed down to the posted speed limit before passing the sign.
How does distance affect speed when using dominoes?
i think that the farther the distance you have, the speed will increase. this is because gravity is pulling it down with force(speed). But when I was doing the experiment in the lab, it seems that as the distance has increased, the time for all the dominoes was also increased and thus this shows that the speed for the dominoes to fall decreased.
How does distance and time affect speed?
Speed affects distance and time. The faster you go, relative to a stationary object, the more your time slows down and distance shrinks according to the stationary observer. However, you would notice nothing unusual time would progress normally and your distance would be the same according to you. According to you, you would see the stationary observer grow in distance and see there time speed up.
A long distance runner starts a race at 1 he increases his speed to 3 during the middle of the race and slows down to 2 at the end in total he runs 2000 meters in 12 minutes what is average speed?
2.8 m/s A+ program answer (:
A liquid cools down and changes to solid what happens to the speed of particles?
The average speed of the particles decreases.
