A minibus travels at a steady speed of 14 m/s along a rural road.
On one journey, 0.60 s passes between the driver noticing a temporary traffic signal and applying the brakes.
Calculate how far the minibus moves during this time.
On a later journey, the minibus travels over the same section of road at the same speed. The driver is more alert and takes 0.40 s to respond.
Explain the difference this makes to the stopping distance of the minibus.
Tests show that replacement tyres give the minibus more grip on a wet road than its worn tyres.
Explain why this permits a shorter safe separation from traffic ahead when the speed is unchanged.