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?
(1) 3 km/h
(2) 4 km/h
31 1 km/h
(4) 2 km/h​

Answer 1

Explanation:

Let common velocity be v

By conservation of momentum

m(3)+2m(0)= (m+2m)v

V= 1km/hr

Ans- (3)