Question

please explain : A driver in car runs at a constant speed of 20 kmph for one hour. Find the acceleration of the car?

Answer 1

The driver is moving with a constant speed for an hour which implies that the change in velocity is zero. Hence acceleration is zero

Answer 2

\[a=\frac{ dv }{ dt }, v=k, \frac{ dk }{ dt }=0\] therefore a=0

Answer 3

the speed of the car did not change in this period .
so acceleration would be zero 0.

Answer 4

Acceleration can not be determined from the given data. Its only stated that the car is moving with a constant speed. This means that only the magnitude of the car's velocity remains constant. All this while the car might be changing its direction and thus varying its velocity all the time.
For example, when a body moves is a uniform circular motion with velocity v, its speed remains constant as the magnitude of v. But, the velocity keeps changing all the time because of the motion on the body on the circle.

Answer 5

thanx every one