Posted by **Diana** on Thursday, April 28, 2011 at 1:40am.

You are driving a car down a straight road at a constant 48 miles per hour.

Consider the following forces:

I) air drag pushing back on the car;

II) gravity pulling down on the car;

III) the ground pushing up on the car;

IV) friction pushing the wheels (and the car)

forward; and

V) friction pushing the wheels (and the car)

back.

Which force(s) act on the car?

1. I, III and V

2. I, II and III

3. II, III and IV

4. I, II, III and IV

5. I and II

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