\textbf{43--} A football with mass $45\,\text{g}$ is shot from a penalty spot at a speed of $20\,\dfrac{\text{m}}{\text{s}}$ toward the goal and hits the goalkeeper at a speed of $16\,\dfrac{\text{m}}{\text{s}}$. What is the total work done on the ball?
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\noindent (1) $-10$ \hfill (2) $-16.2$ \hfill (3) $-32.4$ \hfill (4) $-64.8$
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