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Q.

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 = 10 m/s2

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a

20 N

b

22 N

c

4N

d

16N

answer is B.

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Detailed Solution

From third equation of motion, v2 = u2 + 2as and F = ma
2Fmd=2gh⇒F=mghd=20N

force given by the hand mg+ma=20+0.2g=22N

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