A truck of mass 9000 kg is traveling along a level road at an initial speed of 30 m/s. The driver then shifts into neutral so that the truck is coasting, and the truck gradually slows to a final speed of 12 m/s. (a) Find the total work done on the truck. (b) What force(s) do this work on the truck? (There may be more than one.) (c) The final kinetic energy of the truck is less than its initial kinetic energy. Where does this energy go?
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