Measure Your Reaction Time Here\'s something you can try at home-an experiment t

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. Part A If you catch the ruler 6.0 cm from the lower end, what is your reaction time? Express your answer using two significant figures XIncorrect; Try Again; 5 attempts remaining

Explanation / Answer

Since you are catching the scale at 6cm from the lower end, implies that the lower end has moved 6cm in that specified reaction time (t). This can be calculated from the Newton's laws

S = ut + 1/2 at2 where S is the distance travelled , u is the initial velocity which is zero and a is the acceleration due to gravity. Thus

6x10-2 = 0.5 x 9.8 x t2 Thus t2 = 0.0122 hence the reaction time is t= 0.11 sec

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