An electric motor is used to lift a 600 g600\text{ g}600 g mass.
The current in the motor is 0.80 A0.80\text{ A}0.80 A and the voltage across it is 5.0 V5.0\text{ V}5.0 V.
The total electrical energy transferred to the motor is 30 J30\text{ J}30 J.
Calculate the time taken for the motor to lift the mass. Give your answer to two significant figures.
State the equation linking gravitational potential energy (GPE\text{GPE}GPE), mass (mmm), gravitational field strength (ggg), and height (hhh).
The mass gains 4.5 J4.5\text{ J}4.5 J of gravitational potential energy when it is lifted. Calculate the height the mass is lifted. (Use g=10 m/s2g = 10\text{ m/s}^2g=10 m/s2)