An object mass m=1 is in free fall at a height h(t) of the surface. Considering the presence of a force of air resistance `f_(r)=(dh)/(dt) ` and gravity g=9,8m/s^2, find the differential equation that models the problem.
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The total force is the vector sum of the gravitational and downword l forces:
This is applied when ball is moving downword .
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