Question

A car drives up a straight hill at a constant
speed of 60 kilometers per hour. A truck
drives over the crest of the hill at a constant
speed of 60 miles per hour.
What is the net force on the car and on the
truck?
1. both not zero
2. not zero; zero
3. both zero
4. zero; not zero
It's absolutely not answer 1. could it be 3.??
No. The answer is 4.

A net centripetal force is needed to allow the car to go over the crest of the hill at constant speed.

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