A classical mechanics problem by Tan T

A man is driving his car at a constant speed of 36 km/hour. He gets shocked by seeing a boy standing on the road in front of his way and in order to save him starts applying brakes. The car decelerates at the rate of 5/6 m/s^2 and he stops right in front of the boy after 14 seconds. what was his reaction time (in seconds)?

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