- #1

harujina

- 77

- 1

## Homework Statement

A 1200 kg car travels at 50 km/h and experiences air resistance of 5000 N and road friction of 2200 N. If the wheels push with a force of 7500 N, what is the car's acceleration?

## Homework Equations

a = ƩF/m

## The Attempt at a Solution

I got ƩF = 8590 N [E52°S] then plugged it into the equation,

but it did not work to the correct answer of 0.250m/s^2.

I'm thinking I probably had to make use of the 50 km/h variable somewhere, which I didn't.

When and where would that apply...?