Question

In the experiment of finding the reaction time of Sunil, his friend releases a scale from rest in between the fingers of Sunil and notices the scale to fall by a distance of 20 cm before being held by Sunil. The reaction time of Sunil is (Use g = 10 ms⁻²)​

Answer 1

We know,

D = 1/2 g t^2

D = distance

t = reaction time

so, 20 = 1/2 × 10 × t^2

=> t^2 = 4

=> t = 2 m/s (ans.)