Question: A billiard ball collides elastically with an identical stationary one. Use the fact that mv2/2 may be written as m(v v)/2 to show that

A billiard ball collides elastically with an identical stationary one. Use the fact that mv2/2 may be written as m(v ∙ v)/2 to show that the angle between the resulting trajectories is 90^o.

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