A particle of mass 10 gm is describing S.H.M. along a straight line with period of 2 sec and amplitude of 10 cm . Its kinetic energy when it is at 5 cm from its equilibrium position is
A. `37.5 pi ^(2)` ergs
B. `3.75 pi ^(2)` ergs
C. `3.75pi^(2)` ergs
D. `0.375 pi ^(2)` ergs
