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The motion of a particle is described by...

The motion of a particle is described by the equation `x = at + bt^2` ? where a = 15 cm/s and b = 3 cm/s. Its instantaneous velocity at t= 3 sec will be

A

33 cm/s,

B

18 cm/s,

C

16 cm/s

D

32 cm/ `s^2`

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The correct Answer is:
A
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