A cylindrical piece of metal 850 cm tall with a radius of, Physics

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A cylindrical piece of metal 850 cm tall with a radius of

1. A rock weighing 98 N is thrown downward with a velocity of 20 m/s from the top of a 90 m tall buliding. What is the velocity of the rock at 70 m above the ground? Use conservation of mechanical energy!

2. A cylindrical piece of metal 8.50 cm tall with a radius of 1.95 cm has a specific gravity = 4.0, what is the mass of the cylinder in units of grams?

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