Question

A block of mass m slides with a speed v_o on a frictionless surface and collides with another mass M which is initially at rest. The two blocks stick together and move with a speed of v_o/3 . In terms of m, mass M is most nearly

(A) m/4 

(B) m/3 

(C) m/2 

(D) 2m 

(E) 3m

Answer 1

Correct Option :- (D) 2m

Explanation :-

Conservation of momentum for the inelastic collision gives