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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Recall the relationship between the work $W$ and the change in kinetic energy $\Delta K$. We have:

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

where $K_f$ and $K_i$ are the final and kinetic energies, respectively.