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Steel ball on a spring

A steel ball weighing 128 pounds is suspended from a spring. This stretches the spring (128/101) feet.

The ball is started in motion from the equilibrium position with a downward velocity of 9 feet per second.

The air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in feet per second).

Suppose that after t seconds the ball is y feet below its rest position. Find y in terms of t. (Note that this means that the postive direction for y is down.)

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