The children realise that if they move the plank to the left, it will eventually be capable of supporting the child at the very right-hand edge of the plank.
Calculate how far they will need to move the plank.
(4 mark)

wavelegth as in spectrum red oygbiv

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.