A 40-Kg Mass, Initially at Rest on a Horizontal Frictionless Surface

Multiple Choice

A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?

A) 2.0 m/s
B) 2.7 m/s
C) 4.9 m/s
D) 2.4 m/s
E) 3.6 m/s