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Free Fall

Question 13 S...

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Question 13
Suppose a ball of mass m is thrown vertically upward with an initial speed, v its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed vagain before striking the ground. It implies that the magnitude of initial and final momentum of the ball is same. Yet, it is not an example of conservation of momentum. Explain why?

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Solution

Law of conservation of momentum is applicable to an isolated system (no external force is applied). In this case, the change in velocity is due to the gravitational force of earth.

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