The cube weighing 5 kg is pulled on a horizontal perfectly smooth base with a rope, which is acted upon by a force of magnitude F = 12 N at an angle of 25 ° with respect to the horizontal plane. a) What is the acceleration of the cube? b) The magnitude of the force F begins to increase slowly. What is its size at the moment when the cube rises completely above the base? c) What is the acceleration of the cube at this moment? Draw a picture showing the described situation. Draw the forces acting on it, show the direction of acceleration and construct the equation of motion in vector and in components.

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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?”