Physics

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Stuck again. The paper just says that the position of an object is given by s(t)=t^3. When T=5sec find

A. Position
B. Velocity
C. Acceleration

I'm trying to use the "position equation" which is s=1/2 a t^2 = Vot

However, what do I solve the equation for? It seems like none of the variables are given. =/

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