A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

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.

Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.