The flatbed truck, which carries an 80-kg crate, starts from rest and attains a speed of (72
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The flatbed truck, which carries an 80-kg crate, starts from rest and attains a speed of \(72 \mathrm{~km} / \mathrm{h}\) in a distance of \(75 \mathrm{~m}\) on a level road with constant acceleration. Calculate the work done by the friction force acting on the crate during this interval if the static and kinetic coefficients of friction between the crate and the truck bed are \(
(a) 0.30\) and 0.28 , respectively, or
(b) 0.25 and 0.20 , respectively.
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