My average speed for a journey was 50 mph, my return average speed of 70 mph. Why wasn't my average speed for the round trip 60mph ?
A conveyor belt, with tins placed at regular intervals, is moving at a steady rate towards a labelling machine. A gerbil starts from the beginning of the belt and jumps from tin to tin.
Can you find the lap times of the two cyclists travelling at constant speeds?
Various solids are lowered into a beaker of water. How does the water level rise in each case?
An article introducing the ideas of differentiation.