On turning a corner a car drIver driving at 36 km per hour find a child on the road 55 metre ahead.he immediately applies brakes so as stop within 5 metre. Calculate the retardation produced and the time taken by the car to stop.

Answer 1

vf^2=vi^2+2ad

solve for a. Now I am not certain if by "retardation" you mean a, or the force braking, if force, then force= a/masscar

time:
timetostop= distance/avgveloctiy
= distance/(vf/2)