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

JIPMERJIPMER 2001

Solution:

Applying law of conservation of momentum $ m\times 3=(m+2m){{v}_{1}} $ So, $ {{\upsilon }_{1}}=1\,km/hour $