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A particle moving in a stright line cove...

A particle moving in a stright line covers a distance of x cm in t seconds, where x ` = t^(3) + 6t^(2) - 15t + 18.` Find the velocity and acceleration of the paricle at the end of 2 seconds. When does the particle stop ?

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The correct Answer is:
t = 1 , or, t = -5
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