The distance travelled by a particle up...

The distance travelled by a particle upto tiem x is given by `f(x)=x^(3)-2x+1.` The time c at which at velocity of the particle is equal to its average velocity between times x=-1 and x=2 sec. is

15 sec

`sqrt((3)/(2))` sec

`sqrt(3)` sec

`sqrt((7)/(3))` sec

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