# The average value of force times the time of impact

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the average value of force times the time of impact which gave a value of 0.15Ns. This again, proved to be true because it was the same value the force graph had presented. For the diagrammatic representation, I drew out a pictorial of the three different scenarios for before, during, and after. In the before picture, the cart is seen on one end of the table at a zero velocity and zero momentum and a force that will soon be produced by me. On the during picture, it is showing the cart headed towards the book by the force produced by me on the cart (pushing it). The velocity and the initial momentum both in the same direction with both negative values towards the book. The after picture is showing the cart after it hits the book and bounces back towards the direction it came from. It has a final momentum and final velocity both in the same direction with both positive values away from the book. The force in this diagram is seen to go opposite ways; one force is the force of cart on the book and the other is the force that the book does on the cart pushing the cart back toward the direction it came from. PHYS 1010 – page 6