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The acceleration of an object is given by \( a(t)=\cos \pi t \)
P \( \mathrm{ms}^{-2} \) and its velocity at time \( t=0 \) is \( \frac{1}{2 \pi} m s^{-1} \) at origin.

W
Its velocity at \( t=\frac{3}{2} s \) is
(1) \( -\frac{1}{2 \pi} m s^{-1} \)
(2) \( \frac{3}{2 \pi} m s^{-1} \)
(3) \( \frac{1}{\pi} m s^{-1} \)
(4) \( \frac{2}{\pi} m s^{-1} \)
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