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Starting from rest a particle moves in a straight line
P with acceleration

W
\[
\begin{array}{l}
a=\left(25-t^{2}\right)^{1 / 2} \mathrm{~m} / \mathrm{s}^{2} \text { for } 0 \leq t \leq 5 s \\
a=\frac{3 \pi}{8} \mathrm{~m} / \mathrm{s}^{2} \text { for } t5 s
\end{array}
\]
The velocity of particle at \( t=7 \mathrm{~s} \) is:
(1) \( 11 \mathrm{~m} / \mathrm{s} \)
(2) \( 22 \mathrm{~m} / \mathrm{s} \)
(3) \( 33 \mathrm{~m} / \mathrm{s} \)
(4) \( 44 \mathrm{~m} / \mathrm{s} \)
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