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Difficulty Level:

Medium

MCQ

Antonio’s toy boat is bobbing in the water under a dock. The vertical distance H{H} (in cm{cm} ) between the dock and the top of the boat’s mast tt seconds after its first peak is modeled by the following function. Here, tt is entered in radians. H(t)=5cos(2π3t)35.5{H}({t})=5 \cos (\frac{2 \pi}{3} t)-35.5

How long does it take the toy boat to bob down from its peak to a height of 35 cm-35 {~cm} ? Round your final answer to the nearest tenth of a second.

Select all that apply :

0.70.7

2.32.3

9.79.7

0.20.2

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