• Insufficient information. *** (Constant) acceleration is calculated using the equation [ (Vfinal - Vinitial) = AT ] *** We should re-write that to solve for acceleration, [ A = (Vfinal - Vinitial) / T ] *** Let's imagine an unreal scenario. The fellow accelerates to 70mph instantly. T = 0. The fellow undergoes infinite acceleration. OK. What about T = 1 second? A = 70mph / 1sec * 1h/60m * 1m/60s * 1609meter/mile = 31.3 m/s/s or 3.19g (one g = 9.81 m/s/s). What about 10 seconds? 0.319g. *** but note that this assumes that everything is perfectly solid and rebounding and non-stretching - sort of like a billiard ball. However: in the real world, the bag is going to stretch and the person in the bag is going to compress and so the actual number of gs ought to be slightly less than the sterile, unrealistic mathematical calculations show.
    • Sweet Deer
      Say it is non-compressible metal box inside a non-stretchable metal box?
      Yeah, something along those lines would fit the equations much better, but my guess is that several more impossible properties would have to be assigned to the items involved in order for the scenario to match the equations EXACTLY. For example: everything occurring in a perfect vacuum; an unbreakable and zero-ductility hook on the train to "snag" your box, a train car with similar properties to your boxes, then there's the car frame and axles and wheels and bearings and tracks and track bed and so on and so on

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