Measurement of average speed
Done by measuring a distance with a tape then measuring the time with a stop clock.
THEN AVERAGE SPEED =
Measured in metres per second (m/s)
Instantaneous speed is the speed over a small distance e.g. 5cm.
This is done with a light gate attached to a computer
This is the change in speed divide by the time taken
Electricity sold at peak price.
Electrcity bought back at night at low price and used to pump water back up to the top dam.