ll T-Mobile 3:28 PM * 39%. a session.masteringphysics.com C Chapter 2-3 Problem

Question

ll T-Mobile 3:28 PM * 39%. a session.masteringphysics.com C Chapter 2-3 Problem 2.3 In the chapter, we saw that a person's reaction time is generally not quick enough to allow them to catch a dolar bill dropped between the fingers. A demonstration of reaction time is to hold one end of a dollar bill so that it hangs lengthwise below your fingers, then ask a friend to hold his fingers near the lower comer of the bill. When you release the bill, he is to try to catch t Part A If a typical reaction time in this case is 0.25 s, how long would a bill need to be for a person to have a good chance of catching it? Express your answer using two significant figures. Provide Feedback

Explanation / Answer

Since given that reaction time is 0.25 sec, So bill's length should be to catch it will be

H = U*t + 0.5*g*t^2

U = 0 m/sec

a = g = 9.81 m/sec

t = 0.25 sec

So,

H = 0*0.25 + 0*9.81*0.25^2

H = 0.3066 m = 30.66 cm = 31 cm

Length of bill = 31 cm

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