chp2 problem59 soln

Physics: Principles with Applications

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The deceleration is 30 g , namely a = -30 g = -294 m/s 2 . Initially, v 0 = 100 km/h = 27.8 m/s Finally , v = 0. Want: x = ? Use equation #3, we have x s m s m x a v v × - × + = + = ) / 294 ( 2 ) / 8 . 27 ( 0 2 2 2 2 2 0 2 Solving for x, we get m x 31 . 1 = This is the length over which the front end of the car must collapse in order for the driver
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Unformatted text preview: to survive; it is the length of the so-called crumple zone. You can see that the longer the crumple zone, the smaller the deceleration, the better the chance of the driver’s survival! v 0 = 100 km/h v = 0 x initial final a =-30 g D x=?...
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