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Consider a situation in which your car, when coasting down a straight downhill road, acquires a constant velocity.

In this situation:
a. gravity is the only force on the car
b. friction is the only force acting on the car
c. the net force acting on the car is zero
d. there must be some net force acting on the car since it is moving

Give me a break.
Netforce= ma but here a is zero (constant velocity), so net force is ..

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