Question

A car with a mass of 1240kg starts from rest and accelerates to a speed of 19.4m/s in 10.2s. Assume that the force of resistance remains constant at 376N during this time. What is the average power developed by the car's engine?

Answer 1

Power, P = 38459.16 W

Step-by-step explanation:

Given that,

Mass of a car, m = 1240 kg

Initial speed, u = 0

Final speed, v = 19.4 m/s

Time, t = 10.2 s

The resistance force, R = 376 N

We need to find the average power developed by the car's engine. It is given by the formula as follows :

`P=F* v\\\\P=(ma-R)v\\\\P=((mv)/(t)-R)v\\\\P=((1240* 19.4)/(10.2)-376)* 19.4\\\\P=38459.16\ W`

So, the required power is 38459.16 watts.