1.

A particle is oscillating according to the equation\[X=7\cos 0.5\pi t\], where t is in second. The point moves from the position of equilibrium to maximum displacement in time                                            [CPMT 1989]

A.            4.0 sec                                     
B.            2.0 sec
C.            1.0 sec                                     
D.            0.5 sec
Answer» D.            0.5 sec


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