4.18 Figure P.4.1 depicts a block of mass m = 300 kg at rest on a frictionless ramp that makes an angle of 0 = 25° with the horizontal. The block is held in place by a horizontal force of magnitude F. What is the magnitude of the force? Ing

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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?”