A 40-Kg Mass,initially at Rest on a Horizontal Frictionless Surface,is Struck

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 $\degree$ 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