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/s 2
Text Solution
Verified by ExpertsThe correct answer is:
A
Velocity of ball just after throwing
v = 
= 
= 
m/s
Let a be the acceleration of ball during throwing, then
v 2 = u 2 + 2as = 0 2 + 2as
a = 
= 
= 100 m/s 2
F - mg = ma
F = m (g + a) = 0.2(10 + 100) = 22 N
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