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A car is moving on a straight road at a constant speed of 70 km/hr. What forces are in balance to keep the car moving at this constant speed?

Verified Answer :

MoSikder

The driving thrust of the car produced by the engine is the main forward force. 

The main opposing forces are air resistance (from the wind) and friction (between the tyres and the road)

Since the air resistance + friction = driving force the car moves at a constant speed.

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