A car of weight is on an inclined road that rises by 100 m over a distance of 1 Km…

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

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 \text{ ms}^{-1}

, the car needs power

P

. If it needs power

\frac{P}{2}

while moving downhill at speed

v

then value of

v

is: (1)

20 \text{ ms}^{-1}

(2)

5 \text{ ms}^{-1}

(3)

15 \text{ ms}^{-1}

(4)

10 \text{ ms}^{-1}