The speed of car of mass m starting from rest moving in a straight line under the influence of constant power P is given by $v=k (\frac{Px}{m})^{\frac {1}{3}}$ after travelling distance x ignoring energy losses. k is equal to,
(A) 2
(B) $2^\frac {1}{3}$
(C) 3
(D) $3^\frac {1}{3}$
Continue reading $v\propto (\frac{Px}{m})^{\frac {1}{3}}$