A carpenter of mass 50 kg is standing on a weighing machine placed in a lift of mass 20 kg. A light string is attached to the lift. The string passes over a smooth pulley and the other end is held by the carpenter as shown. When carpenter keeps the lift moving upward with constant velocity (g = 10 m/s²)
- AThe reading of weighing machine is 20 kg
- BThe man applies a force of 350 N on the string
- CNet force on the man is 150 N
- DNet force on the weighing machine is 150 N
✓ Correct answer: B
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