Question

A body of mass 5 m initially at rest explodes into three fragments with mass ratio 3:1:1. Two of fragments each of mass m are found to move with a speed 60 m/s in mutually perpendicular directions. The velocity of third fragment is

(1) 60√2 

(2) 20√3 

(3) 10√2 

(4) 20√2

Answer 1

The velocity of third fragment is obtained as follows: Applying the principle of conservation of linear momentum, we get

Hence, the correct option is (4).