Same topic2 marksDifficulty: Easy
Calculate the work done when a force of 25 N moves a body through 4 m in the direction of the force.
Work, Energy and Power
2 marksDifficulty: Medium
A machine raises a load of 200 N through a height of 2.5 m in 5 s. Calculate the power developed.
Original Khojo Papers practice question — not from a past board paper.
Answer
100 W
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Work done = 200 × 2.5 = 500 J. Power = work ÷ time = 500 ÷ 5 = 100 W.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
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
Same chapter3 marksDifficulty: Medium
State the principle of conservation of energy and give one example of its application.
Work, Energy and Power
Same chapter3 marksDifficulty: Medium
A machine does 3000 J of work in 15 s. Calculate its power.
Work, Energy and Power
Same chapter3 marksDifficulty: Medium
A body of mass 5 kg moves with a velocity of 4 m s−1. Calculate its kinetic energy.
Work, Energy and Power
Same chapter3 marksDifficulty: Medium
A boy of mass 40 kg climbs a staircase of 20 steps, each 15 cm high, in 10 s. Calculate the power he develops. Take g = 10 m s−2.
Work, Energy and Power