-A Block of Mass M = 3

Multiple Choice

-A block of mass m = 3.6 kg,moving on a frictionless surface with a speed vi = 9.3 m/s,makes a perfectly elastic collision with a block of mass M at rest.After the collision,the 3.6 kg block recoils with a speed of v_f = 2.7 m/s.In the figure,the speed of the block of mass M after the collision is closest to:

A) 6.6 m/s
B) 8.0 m/s
C) 9.3 m/s
D) 10.7 m/s
E) 12.0 m/s