1.

The kinetic energy of a particle of mass m moving with speed v is given by `K=(1)/(2)mv^(2)`. If the kinetic energy of a particle moving along x-axis varies with x as `K(x)=9-x^(2)`, then The region in which particle lies is :A. `x ge 9`B. `-3 le x le 3`C. `0 le x le 9`D. `-oo lt x lt oo`

Answer» Correct Answer - 2
As`" "K= (1)/(2) mv^(2) ge 0 ` so ` 9-x^(2) ge 0 rArr -3 le x le 3`


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