Bernard drops a meter stick and on average it falls 0.18 m before it is caught. What is his reaction time?

Answer 1

Use this kinematic equation: Δy = v₀ t + 1/2 a t², where v₀ = 0 because the stick was dropped from rest; -0.18 = 0 - 9.8/2 t², t² = 0.18 / 4.9, t = 0.19 sec.