A copper block with mass m = 200 g, is at rest on a glass surface, where the plane makes an angle θθ = 45∘. Assume that the glass surface is frictionless. Calculate the acceleration of the copper block when it is released from rest. Express your result in m/s2. Using the information presented  calculate the force acting on the mass, m = 200 g, just as it is released from the top of the inclined plane, at y = 8.48 m. Express your answer in Newtons.

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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?”