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Asked by Kim

Let s(t)=-5t^2+40t be the position equation for a rock thrown upwards. At what time t, in seconds, will the rock change directions?
11 years ago

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Answered by Reiny
at its vertex.

the x of the vertex is -b/(2a) = -40/-10 = 4

it will change direction at t = 4 seconds
11 years ago
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Let s(t)=-5t^2+40t be the position equation for a rock thrown upwards. At what time t, in seconds, will the rock change directions?

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