a bus is travelling on a horizontal road at a velocity of 126 km/h when the bus driver notices an object in the road. the brakes are applied and the bus is brought to rest over a distance of 150m. the frictional resistance is 2500n and the bus has a mass of 6000 kg. calculate the retardation of the bus,the time taken to come to a stand still and the braking force of the brakes
vf=0; vi=126km/hr ...change to m/s
vf^2=vi^2+2ad
calculate retardation a in m/s
but a= (brakingforce+2500)/massbuss calculate braking force
finally, time= averagevelocity/distance= 1/2 vi/distance