Which of the following is a non-contact force ?

Which one of the following statements qualitatively explains the second law of motion?

A particle is found to be at rest when observed from a reference frame S1 and the same particle is found to move with a constant velocity when observed from another frame S2. Which of the following s…

A pair of Oxen exerts a force of 140 newton while ploughing the field. The field ploughed is 15 meter long. The work done in ploughing the length of the field is:

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: