Question
The brakes of a truck cause it to slow down by applying a retarding force of $3.0 \times 10^{3} N$ to the truck over a distance of 850 $m$ . What is the work done by this force on the truck? Is the work positive or negative? Why?
Step 1
In this case, the force is applied in the opposite direction to the displacement, so \( \theta = 180^{\circ} \) or \( \pi \) radians, and \( \cos(\theta) = -1 \). Show more…
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