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An 80 kg stuntman jumps out of a window that's 45m above the ground Q. What if he had instead landed on the ground (impact time=10 ms)? |
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Answer» Solution :In this case `overline(F)=(Deltafi-p)/(Deltat)=(0-mv)/(Deltat)=(-(80kg)/(30m//s))/(10xx10^(-3)s)=-240,000N implies overline(F)=-240,000N` This force is equivalent to about 27 tons(!), more than ENOUGH force to break bones and cause fatal brain damage. notice how crucial the impact time is: Increasing the slowing-down time reduces the acceleration and the force, IDEALLY enough to prevent injury. this is the purpose of safety devices such as AIR BAGS in CARS. |
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