First slide
Collisions
Question

A particle of mass m moving with horizontal speed 6 m/sec as shown in figure. If m<<M then for one dimensional elastic collision, the speed of lighter particle after collision will be

Moderate
Solution

v1=m1m2m1+m2u1+2m2u2m1+m2

Substituting m1 = 0,  v1=u1+2u2
v1=6+2(4)=2m/s
i.e. the lighter particle will move in original direction with the speed of 2 m/s.

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