First slide
Collisions
Question

A heavy ball moving with speed v collides with a tiny ball at rest. The collision is elastic, then immediately after the impact, the second ball will move with a speed approximately equal to

Moderate
Solution

v2 =(m2m1m1+m2)u2+(2m1m1+m2)u1

Submitting  m20 and u2=0  we get ,  V22v

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