A 3.0-kg mass sliding on a frictionless surface explodes into three 1.0-kg masses.After the explosion the velocities of the three masses are: (1)9.0 m/s,north;(2)4.0 m/s,30$\degree$ south of west;and (3)4.0 m/s,30$\degree$south of east.What was the magnitude of the original velocity of the 3.0-kg mass?
A)1.7 m/s
B)1.0 m/s
C)1.3 m/s
D)2.0 m/s
E)2.8 m/s

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The Answer of A 3.0-kg mass sliding on a frictionless surface explodes into three 1.0-kg masses.After the explosion the velocities of the three masses are: (1)9.0 m/s,north;(2)4.0 m/s,30$\degree$ south of west;and (3)4.0 m/s,30$\degree$south of east.What was the magnitude of the original velocity of the 3.0-kg mass?
A)1.7 m/s
B)1.0 m/s
C)1.3 m/s
D)2.0 m/s
E)2.8 m/s

A 30-Kg Mass Sliding on a Frictionless Surface Explodes into Three