Question

A stationary body explodes into two fragments each of rest mass 1kg that move apart at speeds of 0.6c relative to the original body. The rest mass of the original body is- 

(A) 2 kg

(B) 2.5 kg

(C) 1.6 kg

(D) 2.25 kg

Answer 1

Correct answer is option is B) 2.5 kg