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A particle is moving in a straight line ...

A particle is moving in a straight line and its distance s cm from a fixed point in the line after t seconds is given by `s = 12t – 15t^2 + 4t^3`. What is the velocity of the particle after 3 seconds?
a) 10 cm/sec
b) 20 cm/sec
c) 30 cm/sec
d) 40 cm/sec

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The correct Answer is:
A, B
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