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A stone weighing 480.0 g is launched vertically from ground level with an initial speed of...

A stone weighing 480.0 g is launched vertically from ground level with an initial speed of 25.0 m/s. The stone experiences a constant air drag or .265 N throughout the flight.
a) What is the maximum height reached by the stone?
b) What will be its speed just before it hits the ground?

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