Question

Compare your answers with those at the back of the book.

A pitcher throws a fastball. When the catcher catches it, (4.2)

(a) positive work is done

(c) the net work is zero

(b) negative work is done

Solution

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Answered 11 months ago
Answered 11 months ago
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Recall the relationship between the work WW and the change in kinetic energy ΔK\Delta K. We have:

W=ΔK=KfKi\begin{aligned} W &= \Delta K \\ &= K_f - K_i \end{aligned}

where KfK_f and KiK_i are the final and kinetic energies, respectively.

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