MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Rotation

Suppose a bal...

Question

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?

Open in App

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.

Suggest Corrections

thumbs-up

12

Similar questions

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?

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

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:

Q. (a) A ball of mass m is thrown vertically upward from the ground with an initial speed v, its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed again before striking the ground. It implies that the magnitude of initial and final momentum of the ball are same. Yet, it is not an example of conservation of momentum. Explain why?
(b) A bullet of mass 20 g is horizontally fired with a velocity

150 m s^{1}

from a pistol of mass 2 kg. What is the recoil velocity of the pistol?

Q. A ball is thrown vertically upwards with an initial velocity of

49 m s^{- 1}

. Calculate: (i) the maximum height attained, (ii) the time taken by it before it reaches the ground again. (Take

g = 9.8 m s^{- 2}

)

Q. A ball is thrown at an angle of

30^{0}

to the horizontal. It falls on the ground at a distance of 90m. If the ball is thrown with the same initial speed at an angle

30^{0}

to the vertical, it will fall on the ground at a distance of-

Join BYJU'S Learning Program

explore_more_icon

Explore more

Standard X Physics

Join BYJU'S Learning Program

CrossIcon