Aroller coaster car rapidly picks up speed as it rolls doen a slope. as it starts down the slope, it's speed is 4m/s. but 3 seconds later, at the bottom of the slope, it's speed is 22m/s. what is its average acceleration?

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.