Here\'s something you can try at home -- an experiment to measure your reaction

Question

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 ruler4.5 cm (~1.8 inches) from the lower end, what is your reaction time?

I posted this already and tried .775 s and that answer is not correct. If someone could show me how to solve it i would appreciate it.

Explanation / Answer

d = 0.5at²

Solved for t :

t = (2d / a)
= [(2 x -0.045m) / -9.8m/s²]
= 0.0958 sec

Hope this helps

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