When we chop cooked vegetables with an electric blender, the blender is set to the first level and does 5 kJ of work in 20 seconds. When chopping hazelnuts, the electric blender is set to the maximum speed at which the power is three times as much as that in the first level.
With how much power does the blender chop the cooked vegetables?
How long will it take to chop the hazelnuts if the blender has to do 90 kJ of work?
