physics
posted by Anonymous .
A car moving with a speed of 85 km/h is brought to rest in a didtance of 60 m. How much time did the car take to stop?

Average speed x time = stopping distance
The average speed during stopping is half the starting speed, or 42.5 km/h
85 km/h = 23.6 m/s
42.5 km/h = 11.8 m/s
Time = 60m/11.8m/s = 5.1 seconds