# Magnitude of total resistant force on a car?

## Homework Statement

A car needs to generate 75 hp in order to maintain a constant velocity of 27.3m/s on a flat road. What is the magnitude of the total resistive force acting on the car. (due to friction,air resistance etc.)

1hp=746 watts

## The Attempt at a Solution

the answer is 2.05*10^3N but idk how to get it.

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Andrew Mason
Homework Helper

## Homework Statement

A car needs to generate 75 hp in order to maintain a constant velocity of 27.3m/s on a flat road. What is the magnitude of the total resistive force acting on the car. (due to friction,air resistance etc.)

1hp=746 watts

## The Attempt at a Solution

the answer is 2.05*10^3N but idk how to get it.
In one second how much energy does the car use? So how much work does the car do against the resisitive force in that second? Over what distance is that work done in that second? What is the relationship between Work, Force and distance?

AM