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Physics

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Elizabeth Roberts

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Cards in this guide (14)
A rock is dropped from a cliff and hits the ground 6.0 seconds later How high is the cliff

176.4 meters

A hammer is dropped off a roof of an apartment building that is 80 meters high How long will it take to hit the ground

The hammer will take square-root(2x80/9.8)= 4.04 seconds to hit the ground.

The distance is related to the time by s=v0t + 1/2 gt^2 where vo, the initial velocity is=0.

The answer is 4.04 or rounded is 4 seconds.

You are driving down the road and hit a bump which causes your fishing tackle box to bounce out of the bed of your pickup The box decelerates at a rate of 3 ms and skids 24 meters before coming to

The box comes to 12m/s.

A plane is uniformly accelerated from 60 ms to 80 ms in 12 seconds what is the distance traveled by the plane during this period

((60m/s+80m/s)/2)x12s=840m

A jogger runs at an average speed of 5 ms for 3 minutes then finishes with an average speed of 4 ms for 2 minutes What is his average speed in ms for the run

4.6ms

A speed bike tops a hill at 3.50 ms and accelerates steadily down the hill until reaching a speed of 11.4 ms after 4.20 seconds How far did the bike travel during this period

31.30

Find the uniformed acceleration that causes a car's velocity to increase from 32 ms to 96 ms in a period of 8.0 seconds

The average uninformed acceleration is (delta-V) / (delta-T). Delta-V = (96 - 32) = 64 m/s. Delta-T = 8.0 seconds. A = (64 m/s) / (8.0 sec) = 8 m/s2

A plane traveling at 80 ms lands on a runway and comes to rest after 10 seconds What was the plane's deceleration

-80/10 = -8 m/s2

A jogger runs at an average speed of 5 m/s for 3 minutes, then finishes with an average speed of 4 m/s for 2 minutes What is his average speed in m/s for the run

4.60

An arrow is shot straight up at an initial velocity of 250 ms How long will it take the arrow to hit the ground

51 seconds

How far does a plane fly in 15 seconds while its velocity is increasing from 75 ms to 145 m s at a uniform rate of acceleration

If it accelerates from 75 m/s to 145 m/s at a uniform rate, then its average speed during

the acceleration is 0.5(145+75) = 110 m/s.

Distance covered in 15 sec at average speed of 110 m/s = (15 x 110) = 1,650 m = 1.65 km.

What is the acceleration of a car that slows down from 60 ms to 40 m s during a period of 10 seconds

-2 m/s^2

A motorcycle traveling at 15 m s accelerates at a constant rate of 4.0 ms over a distance of 50 meters What is the final velocity of the motorcycle

25 m/s

A rifle is shot straight up and the bullet leaves the barrel at a speed of 245 m s How long will it take the bullet to hit the ground

50 sec.

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A race car accelerates from rest at a rate of 6 ms How fast will the car be going after 5 seconds

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