Two simple harmonic motions are represented by the equation $\mathrm{y}_1 = 0.1\sin\left(100\pi t + \frac{\pi}{3}\right)$ and $y_2 = 0.1\cos\pi t$. The phase difference of the velocity of particle 1 w.r.t. the velocity of the particle 2 is\\
(1) $-\pi/6$\\
(2) $\pi/3$\\
(3) $-\pi/3$\\
(4) $\pi/6$