Q.
A bomb moving with velocity (40i^+50j^−25k^)ms−1 explodes into two pieces of mass ratio 1:4. After explosion the smaller piece moves away with velocity (200i^+70j^−15k^)ms−1. The velocity of larger piece after explosion is
Let the mass of the unexploded bomb be 5m. It explodes into the two pieces of masses m and 4m respectively.
Initial momentum of the unexploded bomb =5m(40i^+50j^−25k^)
After explosion, momentum of the smaller piece =mv1=m(200i^+70j^+15k^)
and momentum of the larger piece = 4mv2 where v1 and v2 are the velocities of the two pieces respectively.
According to the law of conservation of momentum, we get 5m(40i^+50j^−25k^)=m(200i^+70j^+15k^)+4mv2 4mv2=5m(40i^+50j^−25k^)−m(200i^+70j^+15k^) v2=41(180j^−140k^)=45j^−35k^