A firman jumps from a bridge to rescue a suicidal woman and falls 132 ft before

Question

A firman jumps from a bridge to rescue a suicidal woman and falls 132 ft before hitting the water. A. How long did the fall take? (His measured speed is 2.8 s) B. What was his impact speed? (His estimated speed is 60 mi/h) C. If the impact only lasted 0.1s what was his acceleration? 20) A fireman jumps from a bridge to rescue a suicidal woman and falls 132 before hitting the water. a) How long did the fall take? (His measured speed is 2.8 [s]) b) What was his impact speed? (His estimated speed is 60 [mi/h]) c) If the impact lasted only 0.1 [s], what was his acceleration? d) Is this survivable?

Explanation / Answer

g = 32.17 ft/s^2

a)H = 0.5*gt^2

or 132 = 0.5*32.17*t^2

or t=2.86 s

b)speed = 32.17*2.86

=92 ft/s

c)acceleration = change in speed/time

=92/0.1

=920 ft/s^2

d)the deleration is close to 28.59G. Hence he can survive it.

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