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 where no external force is applied. In this case, the change in velocity of the ball (upwards and downwards) is due to the gravitational force of the Earth. That is why this motion of ball is not an example of conservation of momentum.

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Q. 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?

Q. 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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; 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 magnitudes of initial and final momenta of the ball are same. This is an example of:

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A ball of mass 'm' is projected from the ground with a speed 'u' at an angle 'z' with the horizontal.The magnitude of the change in momentum of the ball over a time interval from beginning till it strikes the ground again is.

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