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# Question and Answer

A man throws a ball of mass $$0.4\ kg$$ vertically upwards with a velocity of $$10\ m/s$$. What will be its initial momentum? What would be its momentum at the highest point of its reach?
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## QuestionPhysicsClass 9

A man throws a ball of mass $$0.4\ kg$$ vertically upwards with a velocity of $$10\ m/s$$. What will be its initial momentum? What would be its momentum at the highest point of its reach?

Given that,
Mass of ball $$m=0.4\ kg$$.
Initial velcotiy of ball $$u =10\ m/s$$.
Initial momentum of the ball will be given as,
$$P_i=mu=0.4\times 10=4\ kg\ m/s$$.
At the highest point, velocity of ball is zero.
So momentum of the ball $$P_f=0.4\times 0=0$$.