Question

Bomb of mass 16 kg at rest explodes into two pieces of masses of 4 kg and 12 kg.
The velocity of the 12 kg mass is 4 m/s. The kinetic energy of the 4 kg mass is

Answer 1

From the given data

m1v1 = m2v2

KE1=1/2(m2 v22 )=1/2(4)(144)= 288J

So the kinetic energy of other mass is 288J

Answer 2

k.e=12×12×4×4/2×4=288 Joule