Mathematics

Problem

## End of Chapter 10 Drill The answers are in Chapter 24. 2. A baseball diamond has right angles at each of the bases, which are 90 ft apart. A baseball player is running from second base to third base at a rate of

30 \mathrm{ft} / \mathrm{s}

. How fast is the distance between the player and home plate changing when the player is halfway from second base to third base? (A)

-\frac{30}{\sqrt{5}} \mathrm{ft} / \mathrm{s}

-30 \mathrm{ft} / \mathrm{s}

(C)

-\frac{135}{\sqrt{5}} \mathrm{ft} / \mathrm{s}

(D)

-135 \mathrm{ft} / \mathrm{s}

(A)

-\frac{30}{\sqrt{5}} \mathrm{ft} / \mathrm{s}

-30 \mathrm{ft} / \mathrm{s}

(C)

-\frac{135}{\sqrt{5}} \mathrm{ft} / \mathrm{s}

(D)

-135 \mathrm{ft} / \mathrm{s}

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