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pls show the calculation so i can understand it. thank you Let s represents the displacement, and let t represents the time for an object

pls show the calculation so i can understand it. thank you

Let s represents the displacement, and let t represents the time for an object moving with rectilinear motion, according to the given function. Find the instantaneous velocity for the given time.

s = 3t3 - 5t2 ; t = 4

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