Question: If an object moves along the y axis (marked in feet) so that its position at time x (in seconds) is given by the indicated

If an object moves along the y axis (marked in feet) so that its position at time x (in seconds) is given by the indicated functions in Problem, find
(A) The instantaneous velocity function v = f(x)
(B) The velocity when x = 0 and x = 3 seconds
(C) The time(s) when v = 0
f(x) = 80x - 10x2

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