Problem 1-5

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1-5. A sandbag is dropped from a hot air balloon. The net effect of both aerodynamic drag  and gravity is to produce an acceleration ay = g – cv where c (equal to 6.00×10-4 m-1) is a drag coefficient with units of m-1 when v is expressed in m/s. The positive y direction is downward. Determine the sandbag’s speed after it has fallen 400 m.

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