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CJ
CJ asked in Science & MathematicsPhysics · 7 years ago

Physics Homework Help Please?

I have been stuck on this problem for a while and I can't figure it out.

Ball A moving along a straight line at 2 m/s collides elastically with ball B of same mass moving at -3 m/s. What is the velocity of the balls A and B after collision?

a)2 m/s, -3 m/s

b)-3 m/s, 2 m/s

c)2 m/s, 3 m/s

d)-2 m/s, - 3m/s

Update:

Thanks Jim

1 Answer

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  • ?
    Lv 7
    7 years ago

    By logic:

    All answers preserve KE but

    after colliding, Ball A can't continue its original direction, so must reverse direction; same with Ball B: the only answer that makes sense is b) <= ANS.

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