Two blocks A and B of the same mass 1.03 kg are released from rest on a 29.6° incline when they are S = 17.2 m apart, as shown. The coefficient of friction under the upper block A is 0.18, and that under the lower block B is 0.31. Compute the distanced travelled by block B (in m) until the blocks touch each other. Round off only on the final answer expressed in 3 decimal places.

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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?”