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Collisions

Question

A moving body of mass m and velocity 3 km/h collides with a rest body of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity (km/h)

Moderate
Solution

Initial momentum =  m×3+2m×0=3m
Final momentum =  3m×V
By the law of conservation of momentum 
3m=3m×VV=1km/h



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