A particle executes a S.H.M. of amplitude 4 cm and period 4 sec. If at time t=0, the net force acting on the particle is zero, then its velocity at that point is given by

Options

A. `2pi cm//s`
B. `pi cm//s`
C. `pi//2 cm//s`
D. `(3pi)/(4) cm//s`

Answer

A

Explanation

At time t=0, the net force acting on the particle is zero.
`therefore a=0 as m = ne 0` i.e. the particle has maximum velocity at the mean position.
`v_("max")=omega A=(2pi)/(T)xxA=(2pi)/(4)xx4=2 pi cm//s`