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**1. Homework Statement**

Two cars start 10 meters up a hill. Car A has a mass of 9 grams and Car B has a mass of 2 grams. Additionally, both cars must travel the same distance to the finish line.

a) If friction is ignored which car will win the race?

b) If friction is not ignored, which car will win the race.

**2. Homework Equations**

u + k = u + k

**3. The Attempt at a Solution**

a) Both cars will finish at the same time because at any point on the track, both cars will have equal velocities.

b) Car B will finish first because it is lighter, so it will have less of a friction force that will slow it down less. As a result, Car B will move faster and thus reach the finish line first.

Is this right?

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