Work Energy and Power - Result Question 67

70. Two identical balls A and B moving with velocities $+0.5 m / s$ and $-0.3 m / s$ respectively, collide head on elastically. The velocities of the balls $A$ and $B$ after collision, will be, respectively

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(a) $+0.5 m / s$ and $+0.3 m / s$

(b) $-0.3 m / s$ and $+0.5 m / s$

(c) $+0.3 m / s$ and $0.5 m / s$

(d) $-0.5 m / s$ and $+0.3 m / s$

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Answer:

Correct Answer: 70. (b)

Solution:

  1. (b) When the identical balls collide head-on, their velocities are exchanged.