Original Khojo Papers practice question — not from a past board paper.
3000 W or 3 kW
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Work done = mgh = 500 × 10 × 12 = 60,000 J, so the power is 60,000 ÷ 20 = 3000 W.
From the same topic and chapter, at a similar level.
A ball of mass 0.5 kg is dropped from a height of 20 m. Calculate its kinetic energy just before it strikes the ground and its velocity at that instant. Take g = 10 m s−2 and ignore air resistance.
Work, Energy and Power
A body of mass 2 kg is raised through a height of 10 m. Calculate the potential energy gained. Take g = 10 m s−2.
Work, Energy and Power
A machine does 3000 J of work in 15 s. Calculate its power.
Work, Energy and Power
When is the work done by a force zero, even though the force acts on a moving body?
Work, Energy and Power
A force of 35 N moves a body through 6 m in the direction of the force. Calculate the work done.
Work, Energy and Power
A body of mass 5 kg moves with a velocity of 4 m s−1. Calculate its kinetic energy.
Work, Energy and Power
