Answer :

The answer is friction and and air dynamics.

Answer:

The answer to the given question is the "friction causes negative acceleration".

Explanation:

In this question the answer is friction causes negative acceleration because when the car moves down in the 45 kph speed So tires and the road has friction and if the driver does not use brake and he foot off his leg to gas pedal So because of friction car slows down.

That's why the answer to this question is "friction causes negative acceleration".

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