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

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The Answer of 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

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