If a person approaching a parked car its image apprearing on the car mirror will change Why wa cannot calculate this change through calculus dv/dt =-du/dt (v^2/u^2)

We can't compute this change through math in light of the fact that without central length we cannot figure protest remove and in addition picture separate, If a man moving toward a stopped auto its picture showing up on the auto mirror will change, and this change can't be ascertained utilizing analytics.