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January 29, 2015

January 29, 2015

Posted by **johny** on Wednesday, May 30, 2012 at 11:33am.

i don't even understand this question....theres a lot going on in the question.....help needed..

- physics -
**Elena**, Wednesday, May 30, 2012 at 1:51pm100km/hr = 27.78 m/s.

Through the Work-Kinetic Energy Theorem, the amount of work done by the air bag on the driver must equal the change in the driver's kinetic energy (the final kinetic energy is 0, the initial KE = m• v²/2)

ΔKE = W,

ΔKE = 0 - m• v²/2 = m• v²/2.

W =F(ave) •s(c).

m• v²/2 = F(ave) •s(c).

F(ave) = m• v²/2• s(c) =

= 60•(27.78)²/2•0.3 = 7.7•10^4 N.

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