A stationary mass explodes in to two parts of masses 0.4 Kg and 4 Kg . if the larger mass has a kinetic energy of 100J ,what is the kinetic energy of the small mass ?

Answer 1

2 v^2 = 100
v = 10/sqrt 2 = speed of 2 kg mass

4 (10/sqrt 2) = .4 V
V = 100/sqrt 2 speed of small mass

(1/2)(.4)(10,000/2) = 1,000 = Ke of little mass