JEE Main 2006 Physics question
A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m which applying the force and the ball goes upto 2 m height further, find the magnitude of the force. Consider
Answer: (1)
Solution
The ball starts and ends at rest; it rises m in total, and the hand's force acts over the first 0.2 m. Work–energy: $F(0.2) - mg(2.2) = 0 ⇒ F =
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