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

When a stone tied to a string is whirled in a circle, the work done on it by the string:

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?

The time period of a pendulum –

Which of the following is a non-contact force ?

Given below are two statements, one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A): In simple harmonic motion, the potential energy of the particle is maximum at the…