JEE Main 2016 Physics 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 on the car. While moving uphill on the road at a speed of ms, the car needs power P. If it needs power while moving downhill at speed then value of is:
Answer: (3)
Solution
The road rises 100 m in 1000 m, so and the component of weight along the slope is . The friction is . **Uphill** both oppose the motion, so the engine must supply and
P = 0.15W × 10 = 1.5W.
**Down
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