question_answer 22)

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.

Answer:

Potential energy of the object                                                                                                     Let  be the velocity of the object at half the height i.e., after travelling 2.5 m. Then                        So,          Then,    Kinetic energy