Calculus
posted by Andrea .
the height of an object thrown on the surface of a certin planet is s(t)=80t16t^2. what is the velocity? what is the acceleration? when is the velocity zero?

v(t) = s'(t) = 8032t
a(t) = v'(t) = 32
when is velocity zero?
when is 8032t = 0 ?
solve for t
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