Question

Suppose a ball of mass'm' is thrown vertically upwards with an initial speed V, its speed

decreases continuously till it becomes zero. Therefore, 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 momenta of the ball are same. Yet, it is not an example of conservation of momentum.

Explain why.​

Answer 1

Answer:

No

Explanation:

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.