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^{2}m with t in sec. Assume a rock is dropped from the top of a 400-m cliff. Find the speed of the rock at t = 6 sec.

The problem is.. i don't know if the "m" is part of the equation or not.. like should i plug in the 400 as

s = 3.8t

^{2}(400) and then find the derivative and plug in 6 for t..

or should i just interpret the m as "meters" because s is a function to find position.. which would be in meters..

and in this case i'd just find the derivative of 3.8t

^{2}and then plug in 6 for t...

hmm?