A block slides down an inclined plane and accelerates. The coefficient of friction is a. Static and depends on angle of inclined plane. b. Kinematic and depend of mass of block. c. Static and depend on mass of block. d. Kinematic and depends on angle of inclined plane. Show your work or reasoning:

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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?”