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A particle moves under the law s=t^(3)-4...

A particle moves under the law `s=t^(3)-4t^(2)-5t.` If its acceleration is `4" units/sec^(2),` then its velocity is

A

9 units/sec

B

`-9` units/sec

C

18 units/sec

D

`-18` units/sec

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The correct Answer is:
B
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