In a direct impact, a ball of mass 10 kg moving at 2 m/s strikes a stationary ball of mass 2 kg. the moving ball comes to rest after collision. The velocity of the second ball is
A12 m/s
B20 m/s
C2 m/s
D10 m/s
A12 m/s
B20 m/s
C2 m/s
D10 m/s
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