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?

A particle moving in a straight line covers a distance of x cm in t s

1.	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?
A.	1/4 second
B.	1/3 second
C.	1 second
D.	1/2 second
Answer» D. 1/2 second

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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?

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