Question

A car of weight 20000 N climbs up a hill at a steady speed of 8m/s gaining a height of 120 m in 100 s

calculate :

a] work done by the car

b] power of engine of car

Answer 1

Given that,

W=mg = 20000N

So, m =W/g= 2000 kg
as g = 10m/s2
t =100s
h = 120m
(a) Work done by the car, W = Increased energy of the car
= mgh = 20000 x 120 =2.4x ${10}^6$J
(b) Power of engine
P = W/t
= 2.4 x ${10}^6$J / (100s)
= 2.4 x ${10}^4$W