Question

A man is riding on a cycle with velocity 7.2 km/hr up a hill having a slope 1 in 20. The total mass of the man and cycle is 100 kg. The power of the man is

• A. 200 W
• B. 175 W
• C. 125 W
• D. 98 W

Answer 1

Answer: (D)

98 W

Answer 2

Slope is given 1 in 20

∴ $\sin \theta = \frac { 1 } { 20 }$

When man and cycle moves up then component of weight opposes it motion i.e.

So power of the man

$P = F \times v$ $= m g \sin \theta \times v$ =