10. A man throws a water balloon down off the edge of a building. If he wants the water balloon to hit the ground at a velocity of -30.0 m/s and the building has a height of 20
meters, how fast should he throw the water balloon?

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.