A block of ice with a mass of 2.50 kg is moving on a frictionless, horizontal surface. At t=0, the block is moving to the right with a velocity of magnitude 6.00 m/s.  Calculate the magnitude of the velocity of the block after the following force has been applied for 6.0s: a force of 5.00N directed to the right.  Calculate the magnitude of the velocity of the block after the following force has been applied for 6.00s: a force of 7.00 N directed to the left.

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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?”