A truck of mass 8,000 kg is travellingalong a level road at an initial speed of

Question

A truck of mass 8,000 kg is travellingalong a level road at an initial speed of 25 m/2.  The driver then shifts into neutral so that the truck is coasting, and the truck gradually slows to a final speed of  13 m/2.

(a) Find the total work done on the track ??? J

(b) What force(s) do this work on the truck ? ( There may be more than one, Select all that apply)

      - air drag

     - friction from the road

     - gravity

     - the normal force from the road

(c) The final kinetic energy of the truck is less than its initial kinetic energy.  Where does this energy go ? ( Select all that apply.)

      - heat within the road

      - heat within the air

      - gravitational potential energy

     - heat within the vehicle

Explanation / Answer

a) total work done = change in K..E = - 1824000 J

b) air drag

- friction from the road

c) heat within the road

- heat within the air

heat within the vehicle

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