A balloon is rising vertically upward at 22m/s. If jane is standing 45 metres away from where the balloon is lifted, how fast is the balloon flying away from jane at the moment when the balloon is 70metres high from the field?
A cylindrical container , with the top ended is opened, is to be constructed to hold a volume of 1.50m³ . Find the dimensions of the container such that the materials used would be a minimum. Give your answers to 2 decimal places.