A stationary bomb explodes into two parts of masses in the ratio of 1:3 .If the heavier mass moves with a velocity 4𝑚𝑠 −1 , what is the velocity of lighter part?

Question: A stationary bomb explodes into two parts of masses in the ratio of 1:3 .If the heavier mass moves with a velocity 4𝑚𝑠 −1 , what is the velocity of lighter part?