A car of weight $W$ is on an inclined road that rises by 100 m over a distance of 1 km and applies a

Question

A car of weight $W$ is on an inclined road that rises by 100 m over a distance of 1 km and applies a constant frictional force $\frac{W}{20}$ on the car. While moving uphill on the road at a speed of $10 \mathrm{~m} \mathrm{~s}^{-1}$, the car needs power $P$. If it needs power $\frac{P}{2}$ while moving downhill at speed $v$ then value of $v$ is\

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(c)\