-A Block of Mass M = 2

Multiple Choice

-A block of mass m = 2.2 kg,moving on frictionless surface with a speed v_i = 9.1 m/s,makes a perfectly elastic collision with a block of mass M at rest.After the collision,the 2.2 kg block recoils with a speed of v_f = 0.7 m/s.In the figure,the mass M is closest to:

A) 2.6 kg
B) 18.48 kg
C) 2.4 kg
D) 31 kg
E) 2.2 kg