List of top Physics Questions on Work, Energy and Power asked in ICSE Class X board

A fast-moving cyclist stops pedalling on reaching a hilly track. If he continues to move with the acquired energy, then assuming no loss of energy:
A stone is tied to a string and displaced from A to B by application of a constant force F in three different ways as shown in the diagram below. Arrange the three cases in ascending order of the work done by the force. (Given AJB is a semi-circle, 0\(^\circ\)<\(\theta\)<90\(^\circ\) and AB = 20 m)
A ball of mass 20 g falls from a height of 45 m. It rebounds from the ground to a height of 40 m. Calculate:
(a) the initial potential energy of the ball.
(b) the speed of the ball at which it hits the ground.
(c) the loss in kinetic energy on striking the ground.
[g = 10 m/s\(^2\)]
Name the unit of work done, used in subatomic scale.