The magnitude of the net force exerted in the positive x direction on a 9.2kg particle varies in time as shown in the Figure below. If initially the velocity of the particle is +6m/s along the x axis, determine the final velocity of the particle after the 5.0s interval. Please note that (+) and (−) signs are used to denote positive and negative directions along the x axis! Don't forget to use the correct sign in your answer. Express your answer in units of m/sm/s using one decimal place.

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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?”