A meter stick is held vertically above your hand, with the lower end between you

Question

A meter stick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with these two fingers. You can calculate your reaction time from the distance the meter stick falls, read directly from the point where your fingers grabbed it.
If the measure distance is 17.0 cm, what is the reaction time?
t = ?? s
HELP! I have no idea what to do! Please show step by step so i can try to understand.
THANK YOU!

A meter stick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with these two fingers. You can calculate your reaction time from the distance the meter stick falls, read directly from the point where your fingers grabbed it.
If the measure distance is 17.0 cm, what is the reaction time?
t = ?? s
HELP! I have no idea what to do! Please show step by step so i can try to understand.
THANK YOU!

Explanation / Answer

Assuming you mean 17 cm.
x = at^2/2 ==> t = sqrt(2x/a)
a = g = 9.81 m/s^2
t = 0.186 s

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