a car traveling the speed limit
Only if car A runs out of gas first.
The value of acceleration of a car traveling in a straight line at a constant speed is precisely . . . zero.
car traveling with constant speed travels 150 km in two hours. What is the speed of the car?
Because its velocity is changing all the time. The speed is constant, the velocity is not.
No. 'Acceleration' means a change in speed or direction over time. If the car is moving at a constant speed in a constant direction, then it isn't accelerating.
The question is inherantly flawed. A car traveling at a constant speed cannot accelerate, if it could it's speed would not be constant. "Constant speed" means that speed is not increasing or decreasing but remain consistent over time. For example, if you cover 10 feet during each second, your speed is constant. "Constant velocity" implies constant speed, but it has an additional constraint: you can't change your direction. If you travel constantly at 10 feet per second in a straight line, then your speed is constant and your velocity is constant. But if you travel constantly at 10 feet per second in a wiggly line (or a circle, or anything not straight), then your speed is constant but your velocity is NOT constant. If you travel at a constant speed but change direction, velocity is changed. Or if you travel in the same direction but change the speed, velocity is changed. Average speed is is easier: distance/time So, your question should read: Why can a car traveling at an average speed accelerate, but a car traveling at constant speed cannot? Or Why am I asking the wrong questions?
No, the magnitude will be constant, but the direction of the momentum will change to reflect the direction of the velocity.
No it does not because once you change direction you do not have a constant speed.
The answer is that u r travelling with an average speed for that time or a constant speed . it also means that u are travelling with a uniform velocity.
Yes, IF it maintains constant speed on the track. The academic definition of velocity is speed and the associated direction, a vector. A car traveling in a circle is constantly changing direction. However, most people, including physicists when they are not writing textbooks, treat velocity and speed as interchangable such that a car going a constant speed on a circular track would be considered to have a constant velocity even though the direction in which it is traveling is constantly changing.
No. Assuming constant speed, the distance is: distance = speed x time