On increasing the speed of a body to 2 m s-1, its kinetic energy is quadrupled. Then its original speed must be
A)0.25 m/s
B)1 m/s
C)4 m/s
D)2 m/s
A)0.25 m/s
B)1 m/s
C)4 m/s
D)2 m/s
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