p06 057

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57. We convert to SI units: v = 94(1000/3600) = 26 m/s. Eq. 6-18 yields

F =

mv

2

R

=

(85)(26)

2

220

= 263 N

for the horizontal force exerted on the passenger by the seat. But the seat also exerts an upward force
equal to mg = 833 N. The magnitude of force is therefore

263

2

+ 833

2

= 874 N.


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