2) A lift in a shopping centre can transport 20 people to a height of 54 m in a time of 14 s. The lift compartment has a mass of 1420 kg and the average person has a mass of 60 kg.
Calculate the combined mass of the compartment and the 20 people in it.
b Calculate the energy gained as the lift travels upwards.
a
Think about the lift as it rises. Which form of energy is increasing?
с
Calculate the rate at which energy is transferred by the lift motor to the compartment.