A body is acted upon by two unequal forces in opposite directions, but not in one line. The effect is that the body will have

A spring of spring constant k is cut into two equal halves. The spring constant of each half is now

A girl is swinging on a swing in sitting position. When the girl stands up, the period of the swing will :

A truck starts from rest down a hill with a constant acceleration. It achieves 400 meters in 20 seconds. If the weight of the truck is 7 tons then what will be the force acting on it?

We apply a force of 200 Newtons on a wooden Box and push it on the floor at constant velocity. The marginal friction force will be:

Which of the following is a non-contact force ?