A sphere of mass m is moving with a velocity i + 3 j . The coefficient of restitution between the sphere and the sphere and the well is

Q: A sphere of mass m is moving with a velocity $ \hat{i} + 3 \hat{j} $ . The coefficient of restitution between the sphere and the sphere and the well is

(a) 3/4

(b) 9/16

(c) 4/15

(c) 2/3

Ans: (b)