Slowed Down Train · Physics Brawl 2020 #FoL.8

Physics · mechanics

Problem

While arriving at a station, a train decelerates evenly. Its braking distance is

s = 75m

and during the penultimate (second to last) second before stopping, it drives a distance

l = 2.25m

. What is its initial velocity

v_0

before it begins to brake?