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Q.

The position of a particle moving along the y-axis is given as y=3t2−t3  where y is in metre and t is second. The time when the particle attains maximum positive position will be :-         

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a

3 s

b

1.5 s

c

2 s

d

4 s

answer is C.

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Detailed Solution

Velocity V=dydt=6t−3t2

At maximum positive position V = 0

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