Question

1. A car of weight 20000N climbs up a hill at a st eady speed of 8 m/s,gaining a height of 120m in100s.calculate power of engine of car.

Answer 1

Given that,

Weight of the car (mg) = 20000N

t =100s

h = 120m

Work done by the car, W = Increased energy of the car

= mgh = 20000$\times$120 =2.4$\times$10⁶J

Power of engine

$Power=\frac{Workdone}{Timetaken}$

= $\frac{2.4\times {10}^6}{100}=2.4\times {10}^{4}Wor24kW$