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 v again before striking the ground. It implies that the magnitude of initial and final momentums of the ball is same. Yet, it is not an example of conservation of momentum. Explain, why?

Harshit Singh , 3 Years ago

Grade 12th pass