Two identical balls A and B having velocities of and respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be [2016]

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Q.
Two identical balls A and B having velocities of $0.5$ ${ms}^{- 1}$ and $- 0.3 {ms}^{- 1}$ respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be [2016, 1994, 1991]

Solution

Q.
Two identical balls A and B having velocities of $0.5$ ${ms}^{- 1}$ and $- 0.3 {ms}^{- 1}$ respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be [2016, 1994, 1991]

1 $- 0.5 {ms}^{- 1}$ and $0.3 {ms}^{- 1}$

2 $0.5 {ms}^{- 1}$ and $- 0.3 {ms}^{- 1}$

3 $- 0.3 {ms}^{- 1}$ and $0.5 {ms}^{- 1}$

4 $0.3 {ms}^{- 1}$ and $0.5 {ms}^{- 1}$

Ans.
(2)

Masses of the balls are same and collision is elastic, so their velocity will be interchanged after collision.

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Solution

Q. Two identical balls A and B having velocities of 0.5ms-1 and -0.3ms-1 respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be [2016, 1994, 1991]

1 -0.5ms-1 and 0.3ms-1

2 0.5ms-1 and -0.3ms-1

3 -0.3ms-1 and 0.5ms-1

4 0.3ms-1 and 0.5ms-1

Ans. (2) Masses of the balls are same and collision is elastic, so their velocity will be interchanged after collision.

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Q.
Two identical balls A and B having velocities of $0.5$ ${ms}^{- 1}$ and $- 0.3 {ms}^{- 1}$ respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be [2016, 1994, 1991]

1 $- 0.5 {ms}^{- 1}$ and $0.3 {ms}^{- 1}$

2 $0.5 {ms}^{- 1}$ and $- 0.3 {ms}^{- 1}$

3 $- 0.3 {ms}^{- 1}$ and $0.5 {ms}^{- 1}$

4 $0.3 {ms}^{- 1}$ and $0.5 {ms}^{- 1}$

Ans.
(2)

Masses of the balls are same and collision is elastic, so their velocity will be interchanged after collision.