Using the letters for the seven colours and starting with R (Red), what is the correct order for the colours in a rainbow? Your answer should be in the form R Which of these seven colours has the shortest wavelength?

Amassive tractor rolls down a country road. in a perfectly inelastic collision, a small sports car runs into the machine from behind. (i) which vehicle experiences a change of momentum of larger magnitude? a) the car does b) the tractor does c) their momentum changes are the same size d) it could be either vehicle (ii) which vehicle experiences a larger change in kinetic energy? a) the car does b) the tractor does c) their kinetic energy changes are the same size d) it could be either vehicle