Posted by Anonymous on Tuesday, November 27, 2012 at 1:17pm.
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
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