Crey | A particle moving in a straight line covers a distance of x cm in t second, where x = t3 + 6t2 – 15t + 18. When does the particle stop? 1/4 second, 1/3 second, 1/2 second, 1 second

Question

A particle moving in a straight line covers a distance of x cm in t second, where x = t3 + 6t2 – 15t + 18. When does the particle stop?

Options :

1/4 second
1/3 second
1/2 second
1 second

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