MESSAGE HY INSTRUCTOR PULL SCREEN PRINTER VERSIONBACKNET NEXT Chapter 02, Proble

Question

MESSAGE HY INSTRUCTOR PULL SCREEN PRINTER VERSIONBACKNET NEXT Chapter 02, Problem 45 e drawing shows a device that you can make with a piece of cardboard, which can be used to m milliseconds (ms). Calculate the distances (a) di, (b) d2, and (c) d n's reaction time. Hold the card at the top and suddenly drop it. Ask a friend to try to catch the card your friend catches the card, you can determine his or her reaction time in r friend's fingers must be level with the asterisks at the bottom. By noting wher HOLD HERE 180 d 3 120 (a) Number (b) Number (e) Number Units Units Units

Explanation / Answer

The board is freely falling and the initial velocity of that is zero(0) as the person just leaves it without giving it any velocity.

we know S = u*t + a*(t^2)/2

and u = 0 here so S = a*(t^2)/2

where S is distance traveled and t time taken with acceleration a(acceleration due to gravity = 10m/s^2)

so calculating using that formula

for d1 time = 60ms = 60*(10^-3) seconds

S = 10 * 60 *60 *(10^-6)/2 = 18 * 10^-3 m = 0.018 m

d2 time = 120ms = 120*(10^-3) seconds

S = 10 * 120 *120 *(10^-6)/2 = 72 *10^-3m = 0.072 m

for d3 time = 180ms = 180*(10^-3) seconds

S = 10 * 180 *180 *(10^-6)/2 = 162 * 10^-3m = 0.162 m

Please rate my answer, good luck...

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