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Q.

Is it true that when a man throws a ball of mass 0.4 kg vertically upwards with a velocity of 10 m/s, the initial momentum is 4 kg-m/s and the momentum of the highest point of its reach will be zero ?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
In this given question we have;
Mass (m) = 0.4 kg,
and initial velocity (u) = 10 m/s
Initial momentum of the ball = m×u
= 0.4 ×10
= 4 kg-m/s
But if we consider for the highest point, where the ball comes to the rest
i.e velocity at this point  (v) = 0 m/s
So the momentum of the ball at this highest point = m×v
=0.4 ×0=0
= 0
 
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