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## Homework Statement

Along a certain section of road a car (

**mass 1600kg**) will coast in neutral at a constant speed of

**72 km/h**if there is no wind. Examination of a topological map shows that for this section of road the elevation decreases by

**200m**for each

**6000m**of road. What is the total resistive force (friction plus air resistance) that acts on the car when it is travelling at 72 km/h?

## Homework Equations

P=FV, f=ma

## The Attempt at a Solution

Please see the image attached

-Thanks for any help