The following graph depicts the change in energy per second of an 84.0 kg boulder as it falls off a cliff to the ground.

After 3 seconds, what is the approximate speed of the boulder?
833 m/s
3.00 x 104 m/s
O 3.50 x 104 m/s
28.9 m/s

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell