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?
Answers
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
the x of the vertex is -b/(2a) = -40/-10 = 4
it will change direction at t = 4 seconds
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