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InterviewSolution
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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 upto 2 m height further, find the magnitude of the force. (Consider `g=10m//s^2`).A. `16N`B. `20N`C. `22N`D. `4N` |
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Answer» Correct Answer - b Let `upsilon` be the velocity given by hand when the ball reaches a height h `:. (1)/(2)mu upsilon^(2) =mgh`…(i) If `F` is the force applied by the hand then as per question `(1)/(2) m upsilon^(2) + F xx 0.2 = mg (h +2)` Using (i), `mgh + F xx 0.2 = mgh + mg xx 2` `F = (mg xx 2)/(0.2) = 10 mg = 10 xx 0.2 xx 10 = 20 N` . |
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