1. A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s.
a. Write the expression for the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent.
b. Calculate the energy.

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  1. a = drop in potential energy = m g h
    b = gain in kinetic energy = (1/2) m v^2

    work done by friction = a - b

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  2. -1.5kj

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