A transverse sinusoidal wave moves along a string in the positive x-direction at a speed of 10 cm/s. The wavelength of the wave is 0.5 m and its amplitude is 10 cm. At a particular time t, the snap-shot of the wave is shwon in figure. The velocity of point P when its displacement is 5 cm is

`(sqrt(3)pi)/50 hatj m//s`
`-(sqrt(3)pi)/50 hatj m//s`
`(sqrt(3)pi)/50 hati m//s`
`-(sqrt(3)pi)/50 hati m//s`