. Write an expression for the kinetic energy of an object.
If a body of mass m is moving with a speed v, then its K.E. Ek is given by the expression,
Ek = 1/2 mv2
Its SI unit is Joule (J).
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
Find the energy in kW h consumed in 10 hours by four devices of power 500 W
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 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
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?