The equation for free fall at the surface of the moon is s=31.8t^2in with t in sec. Assume a rock is dropped from the top of a 12,000 in cliff. Find the speed of the rock at t=4sec. Iḿ not sure if Iḿ over complicating things, but I do not know if this is plug or chug or if it is more complicated than that, because we have been working on limits and this has nothing to do with this.