Answer:
The average speed of the elevator going down in the abandoned mine is 17.722mph.
Explanation:
If the elevator takes 90 seconds to descend a height of 713m, the average speed of the elevator is:
And if 1m/s is 2.23694mph, the average speed is:
.
Air, water , atomic acid , and pocket rocket
The force between two parallel wires carrying currents in the same direction is attractive. It is repulsive if the currents are in opposite directions.