A cart is constrained to move along a straight line. A varying net force along the direction of motion is exerted on the cart. The cart's velocity v as a function of time t is shown in the graph. The five labeled points divide the graph into four sections. a) Which of the following correctly ranks the magnitude of the average acceleration of the cart during the four sections of the graph? b). Explain your multiple choice selection with clear and concise evidence and reasoning.

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.