A man tries to lift a mass 200kg with a force 100N Is he doing work? Explain. If yes, find the amount of work done If No,

Question

A man tries to lift a mass 200kg with a force 100N

1. Is he doing work? Explain.

2. If yes, find the amount of work done If No, find the force required to lift it.

3. If it is lifted to 2m in 10 seconds, find his power.

Answer 1

1. No work is done, as there is no displacement, 100N force is insufficient to raise 200kg.

2. Force required to lift 200 kg = 200 × 9.8 = 1960N

3. Power = \(\frac{mgh}{t}\) = \(\frac{200×9.8×2}{10}\) = 392W.