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Q.

A particle moves along a straight line such that its displacement at any time t is given bys=t3− 3t2 +  2mThe displacement when the acceleration becomes zero is

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a

0 m

b

2 m

c

3 m

d

-2 m

answer is A.

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Detailed Solution

s=t3−3t2+2u=3t2−6ta = 6t - 6     when t = 1     a = 0S = 1-3+2 = 0
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A particle moves along a straight line such that its displacement at any time t is given bys=t3− 3t2 +  2mThe displacement when the acceleration becomes zero is