A Block of Mass M = 3 $\mathrm { v } _ { \mathrm { i } } = 9.3 \mathrm {~m} / \mathrm { s }$

A block of mass m = 3.6 kg,moving on a frictionless surface with a speed $\mathrm { v } _ { \mathrm { i } } = 9.3 \mathrm {~m} / \mathrm { s }$ makes a sudden perfectly elastic collision with a stationary block of mass M,as shown in the figure.Just after the collision,the 3.6-kg block recoils with a speed of $v _ { \mathrm { f } } = 2.7 \mathrm {~m} / \mathrm { s }$ What is the speed V of the other block?

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