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Q. The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of the acceleration is less than 250;{rm m}/{rm s}^{2}.

If you are in a car accident with an initial speed of 107 km/h and you are stopped by an airbag that inflates from the dashboard, over what distance must the airbag stop you for you to survive the crash?

Q. A uniform electric field of magnitude 229 V/m is directed in the positive x direction. A +21.4-microCoulomb charge moves from the origin to the point (x,y) = (20.0 cm, 13.8 cm).

What was the change in the potential energy (in Joules) of this charge?

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