Homework Help: Calculus

Posted by Andrea on Monday, March 14, 2011 at 12:26pm.

the height of an object thrown on the surface of a certin planet is s(t)=80t-16t^2. what is the velocity? what is the acceleration? when is the velocity zero?

Calculus - Reiny, Monday, March 14, 2011 at 1:45pm
v(t) = s'(t) = 80-32t
a(t) = v'(t) = -32

when is velocity zero?
when is 80-32t = 0 ?
solve for t

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