Physics

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Heyy is anybdy good at physics I am stuck on this question ...

... A camper van with a mass of 2500 kg has a maximum driving force of 2650 N.

The camper van drives along a straight road at a constant speed of 90 kilomatres per hour. At this speed, air resistance is 2000 N and the friction between the tyres and the road is 500 N.

What is the engine exerting?

PLease help !!!

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