2 packing crates of masses 10.0 kilogram and 5.00 kilogram are connected by a light string that passes over a frictionless pulley as in the figure above. The 5.00-kilogram crate lies on a smooth incline of angle 40.0°. Find (a) the acceleration of the 5.00 kilogram crate and (b) the tension in the string.

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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?”