Consider a completely elastic head-on collision between two particles that have

Question

Consider a completely elastic head-on collision between two particles that have the same mass and the same speed. What are the velocities after the collision?

A)The magnitudes of the velocities are the same but the directions are reversed.

B)One of the particles continues with the same velocity, and the other reverses direction at twice the speed.

C)One of the particles continues with the same velocity, and the other comes to rest.

D)More information is required to determine the final velocities.

E)Both are zero

Explanation / Answer

In perectly elastic head-on collision, the velocities of the objects exchange and they directions of travel is reversed.

On the given case, the speeds of particle before collison is same. Therefore, after collision, their speed are same in

magnitude but the directions are reversed.

Thus, the correct option is ( A )

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