A particle moves along a straight line so that its distance s in time t sec is \[s=t+6{{t}^{2}}-{{t}^{3}}\]. After what time is the acceleration zero [AMU 1999]

A particle moves along a straight line so that its distance s in time

1.	A particle moves along a straight line so that its distance s in time t sec is \[s=t+6{{t}^{2}}-{{t}^{3}}\]. After what time is the acceleration zero [AMU 1999]
A.	2 sec
B.	3 sec
C.	4 sec
D.	6 sec
Answer» B. 3 sec

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A particle moves along a straight line so that its distance s in time t sec is \[s=t+6{{t}^{2}}-{{t}^{3}}\]. After what time is the acceleration zero [AMU 1999]

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