Two objects of different masses falling freely near the surface of Moon from same height would

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?

In each of the following a force F is acting on an object of mass m. The direction of the displacement is from west to east shown by the longer arrow, observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

Calculate the work required to be done to stop a car 1500 kg moving at a velocity of 60 km/h?

An object of mass m is moving with a constant velocity v. How much work should be done on the object in order to bring the object to rest?

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?