How long does it take for a high-speed train to come to a complete stop?

[baylayA]

A high speed train traveling at 84 kph locks its wheels and skids 84 meters before coming to a complete stop. If the rate of slowing down is constant, how many seconds will it take for the train to come to a complete stop?

 

[rl.bhat]

Show your attempts.
State the relevant kinematic equations.

 

[baylayA]

i tried converting kph to mps and then seeing how many seconds but the answer was wrong

 

[rl.bhat]

Show your calculations.

 

[baylayA]

84 kph = 23.333333 mps

84m/23.33333 mps = 3.6s

 

[rl.bhat]

Write down the kinematic equations.