A toy car rolls down a ramp at a constant velocity. The car's mass is m = 1.2 kg and the ramp makes an angle of θ = 11 degrees with respect to the horizontal. Assume the rolling resistance is negligible a)What is the magnitude of the car's acceleration, a in m/s2?  b)What is the numeric value for the sum of the forces in the x-direction, ΣFx, in Newtons?  c)What is the magnitude of the force caused by air resistance, Fr in Newtons? (Maintain the assumption that the car's velocity is constant.)

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”