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 v again before striking the ground. It implies that the magnitude of initial
and final momentums of the ball are same. Yet, it is not an example of conservation of
momentum. Explain why?
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Law of conservation of momentum is applicable to isolated system (no external force is applied).
In this case, the change in velocity is due to the gravitational force of earth.When the ball is thrown up, negative force of gravity is applied and so the speed becomes zero.After that due to gravitational force the ball falls down with same initial velocity.
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