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Starting from rest a particle moves in a...

Starting from rest a particle moves in a straight line with acceleration
`a = (25 - t^(2))^(1//2) m//s^(2) " for " 0 le t le 5s`
`a = (3pi)/(8) m//s^(2) " for " t gt 5s`
The velocity of particle at `t = 7 s` is:

A

11m/s

B

22m/s

C

33m/s

D

44m/s

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The correct Answer is:
B
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