A box is sitting on an inclined surface. The angle of the plane is 20 degrees, and the mass of the block is 7 kg.  -What is the magnitude and direction of the acceleration of the block as it slides down the surface? -If it takes the block 3 seconds to slide down the ramp, what is the length of the ramp?

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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?”