Calculus

Use the position function s(t)=-4.9t^2+ 150, which gives the height (in meters) of an object that has fallen from 150 meters. Teh velocity at time t=a seconds is given by: lim as t approaches a s(a)-s(t) divided by a-t

a) find the velocity of the object when t=3

b) at what velocity will the object impact the ground?

Please help.. My teacher didn't explain this very well at all.

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