Question

A truck of mass 8,000 kg is traveling along a level road at an initial speed of 25 m/s. The driver then shifts into neutral so that the truck is coasting, and the truck gradually slows to a final speed of 13 m/s.
(a) Find the total work done on the truck.
the work is equal to the change in the (kinetic) energy of the truck

w = (1/2 m 25^2) - (1/2 m 13^2)

w = 1/2 * 8000 * (25^2 - 13^2)

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