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AP® Calculus AB-BC

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Rates of Change in $y$ from a Polar Equation

APCALC-JBZJZV

The motion of a particle is defined by the polar equation $r=5$.

Which statement best describes the value of the $y$-coordinate of the particle when:

$$\theta=\frac{\pi}{4}$$

A

The $y$-coordinate is decreasing in value.

B

The $y$-coordinate is increasing in value.

C

The $y$-coordinate is not changing in value.

D

Cannot be determined from the given information.