AP Calculus ABmediummcq1 pt
A water balloon is dropped from 400 feet, and its height is feet after seconds. How fast is it falling at seconds?
A. ft/s upward
B. ft/s downward
C. ft/s downward
D. ft/s downward
Explanation
Core Concept
Velocity is , so ft/s. The negative sign means the balloon is falling, so its speed is 64 ft/s downward.
Correct Answer
C ft/s downward
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