Work and Energy...

A porter with a suitcase on his head is climbing up a flight of stairs with a uniform speed. The work done by the ‘weight of the suitcase’ on the suitcase is

When a body rolls down an inclined plane, it has

Two bodies of unequal masses are dropped from a cliff. At any instant, they have equal

A mass of 60 kg is moved vertically upwards through a distance of 4 m. If the gravitational acceleration is 9.8 ms–2, then the work done against gravity is

A person A does 500 J of work in 10 minutes and another person B does 600 J of work in 20 minutes. Let the power delivered by A and B be P_A and P_B respectively. Then,

When a body falls freely towards the earth, then its total energy

In case of negative work, the angle between the force and displacement is

Which one of the following is not the unit of energy?

The work done on an object does not depend upon the

Water stored in a dam possesses