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The displacement of a moving particle is...

The displacement of a moving particle is given by, ` x=at^3 + bt^2 +ct + d`. The acceleration of particle at t=3 s would be

A

2(a+9b)

B

2(9a+b)

C

9(a+b)

D

3(2a+b)

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The correct Answer is:
B
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AAKASH INSTITUTE-Mock test 03-EXAMPLE
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