JEE Main 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 while applying the force, and the ball goes up to 2 m further after leaving the hand, find the magnitude of the force. (g = 10 m/s²)
Answer: (C)
Solution
Speed on leaving the hand (needed to then rise 2 m freely): v² = 2g(2) = 40. During the 0.2 m push (starting
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