Question

It is easy to maintain the motion of a body then to start it.why

Answer 1

in order to the start the motion of a body force is required but no force is required when body moves with uniform velocity along a straight line

Answer 2

It is difficult to start the motion of a body than to maintain it .....simply the reason is that before bringing a body in state of motion the body is in rest so large amount of force required to bring the body from rest to motion but less force to maintain it .For example- riding bicycle from high hill to low hill roads.