Question

An object dropped from rest from the top of a tall building falls y = 16t^2 feet in the first t seconds. Find the speed of the object at t = 3 seconds and confirm your answer algebraically

Answer 1

you should take derivative y to the time t. By making that, you get the velocity equation of the object.

Then, you should put t=3 into the velocity equation, then you can find the answer.