OnlineCBT
Physics · JEE | MOTION IN A STRAIGHT LINE
हिन्दीIn a reaction time experiment, a ruler drops vertically through a distance \( d = 21.0\text{ cm} \) before being caught. Taking \( g = 9.8\text{ m s}^{-2} \), what is the estimated reaction time?
View Answer & Solution
Correct answer · Option B
0.2 s
Explanation
Reaction time \( t_r = \sqrt{\frac{2d}{g}} = \sqrt{\frac{2 \times 0.21}{9.8}} = \sqrt{0.0428} \approx 0.2\text{ s} \).
