A tall building needs a lift to move people from one floor to another.
The builder has a choice of three different lifts.
Each lift takes a different amount of time to move between the two floors.
Look at a bar chart of the time taken for each lift.
i) Lift C takes 12s to move between the two floors.
Draw a bar for lift C on the bar chart.
[1]
ii) Calculate the mean time of the three lift journeys.
Mean = ...................................................... s [2]
iii) Explain which lift uses the most power.
i) One lift uses 50 000 J for a 12 s journey.
Calculate the power of the lift.
Give your answer to 1 decimal place.
Power = .................................................... W [4]
ii) When the lift is broken the stairs are used.
Calculate the work done when a 750 N person climbs a distance of 4 m.
Work done = ...................................................... J[3]
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