What kind of mechanical energy does: a) potential energy of water in a waterfall; b) kinetic energy of a ball thrown vertically upward; c) potential energy of the clock spring during its course; d) potential energy of the door spring when closing the door?
a) into the kinetic energy of water; b) the potential energy of the ball; c) into the kinetic energy of the clock hands; d) into the kinetic energy of the door.
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