1. The problem statement, all variables and given/known data
A bolt is dropped from a bridge under construction, falling 83 m to the valley below the bridge. (a) How much time does it take to pass through the last 20 % of its fall? What is its speed (b) when it begins that last 20 % of its fall and (c) just before it reaches the ground?
2. Relevant equations
3. The attempt at a solution
For part (a) I got the correct answer of .436 seconds by doing 83/4.9=16.94, sqrt16.94=4.12
83 x .20 = 16.6
83-16.6=66.4
66.4/4.9=13.55
sqrt13.55=3.68
4.12-3.68=.436
That answer was correct but I need parts (b) and (c)
A bolt is dropped from a bridge under construction, falling 83 m to the valley below the bridge. (a) How much time does it take to pass through the last 20 % of its fall? What is its speed (b) when it begins that last 20 % of its fall and (c) just before it reaches the ground?
2. Relevant equations
3. The attempt at a solution
For part (a) I got the correct answer of .436 seconds by doing 83/4.9=16.94, sqrt16.94=4.12
83 x .20 = 16.6
83-16.6=66.4
66.4/4.9=13.55
sqrt13.55=3.68
4.12-3.68=.436
That answer was correct but I need parts (b) and (c)
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