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In a head-on collision, a car stops in 0.24s from a speed of 26m/s . The driver has a mass of 79kg , and is, fortunately, tightly strapped into his seat.

What force is applied to the driver by his seat belt during that fraction of a second?

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acceleration

$a=\frac{v_{f}-v_{i}}{t}$

$a=\frac{-26}{0.24}m/s$

$a=-108.33m^{2}/s$

force

f=ma

f=79 *108.33 N

f=8558.33 N

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