An experiment measures how fast a student reacts, a meter stick is dropped from rest falls .2 m before a student catches it. What is the reaction time of the student approximately? The answer is .2 s, but I have no clue how to solve it/:
3 Answers

it starts from rest, so the initial velocity is, Vₒ = 0m/s
it falls a distance of, d = 0.2m
acceleration due to gravity, a = 10m/s²
t = ?
d = Vₒt + ½at²
0.2 = 0 + ½(10)t²
0.2 = 5t²
0.2 / 5 = t²
0.04 = t²
√0.04 = t
0.2 = t

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Figure in the speed of gravity