A body of mass m1 collides elastically with another body of mass m2 at rest. If the velocity of m1 after collision becomes 2/3 times its initial velocity, the ratio of their masses is

Q: A body of mass m1 collides elastically with another body of mass m2 at rest. If the velocity of m1 after collision becomes 2/3 times its initial velocity, the ratio of their masses is

(a) 1 : 5

(b) 5 : 1

(c) 5 : 2

(d) 2 : 5

Ans: (b)