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What is the net force acting on a car travelling downhill with a constant velocity?

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A car is traveling downhill with a constant velocity. Which of the following are true?

(a) There is a net force acting on the car in the downhill direction.
(b) There is a net force on the car in the uphill direction.
(c) There is a net vertical force acting on the car.
(d) There is no net force acting on the car.

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Solution answers and explains the net force which acts on a car travelling downhill with a constant velocity.

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