First slide

Second law

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 upto 2 m height further, find the magnitude of the force. Consider g = 10 m/s²

Moderate

A

20 N
B

22 N
C

4N
D

16N

Solution

From third equation of motion, v² = u² + 2as and F = ma
$2 (\frac{F}{m}) d = 2 gh \Rightarrow F = \frac{mgh}{d} = 20 N$
force given by the hand mg+ma=20+0.2g=22N

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