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Q.

A particle moves along a line by S=23t3−3t2+4t+6 it changes its direction when

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a

t=1,  t=2

b

t=2,  t=4

c

t=0,  t=4

d

t=1,  t=5

answer is A.

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Detailed Solution

S=23t3−3t2+4t+6 V=2t2−6t+4=0 (t−1)(t−2)=0 t=1,  2  sec
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