Question

Measure Your Reaction Time Here's something you can try at home-an experiment to measure your reaction time. Have a friend hold a ruler by one end, letting the other end hang down vertically. At the lower end, hold your thumb and index finger on either side of the ruler, ready to grip it. Have your friend release the ruler without warning. Catch it as quickly as you can.If you catch the ruler 5.7 cm from the lower end, what is your reaction time?
Express your answer using two significant figures.

Answer 1

Answer:

Explanation:

I catch the ruler 5.7 cm from lower end that means my reaction time is equal to time of fall of ruler as free fall under gravity .

h = 1/2 gt²

t = $\sqrt{\frac{2h}{g} }$

= $\sqrt{\frac{2\times 5.7}{9.8} }$

= 1.078 s

= 1.1 s .