A block of mass m=8.5 kg is pushed up on a frictionless inclined plane by a horizontal force F as shown in the figure below. If the angle of inclination is  θ=10o and the block accelerates up with anacceleration of 1.6 m/s2 determine the magnitude of F

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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?”