Elastic Collisions Video Lessons

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Problem: Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If one ball’s initial speed was 2.00 m/s and the other’s was 3.60 m/s in the opposite direction, what will be their speeds and directions after the collision?

FREE Expert Solution

Conservation of momentum:

m1v1i+m2v2i=m1v1f+m2v2f

Condition for a perfectly elastic collision:

e=v2f-vifv1i-v2i

Using conservation of momentum:

velocity of the first ball, v1i = 2.00 m/s

velocity of the second ball, v2i = -3.60 m/s

m1 = m2 = m

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Problem Details

Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If one ball’s initial speed was 2.00 m/s and the other’s was 3.60 m/s in the opposite direction, what will be their speeds and directions after the collision?

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