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shaggyace

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1. A baseball of mass m and initial speed v strikes a catcher's mitt. If the mitt moves x as it brings the ball to rest, what is the average force it exerts on the ball? expressing in terms of given variables.

2. A force of magnitude 7.50N pushes three boxes with masses m1=1.30kg, m2=3.20kg, and m3=4.90kg. Find the magnitude of the contact force between boxes 2 and 3.

3. A farm tractor tows a 3500 kg trailer up a 20 degree incline with a steady speed of 3.0 m/s. What force does the tractor exert on the trailer (ignoring friction)?