an object dropped from rest from the top of a tall building falls y=16t^2 feet first t seconds
(a)find teh speed of a object at t=3s and confirm algebraically

Question

an object dropped from rest from the top of a tall building falls y=16t^2 feet first t seconds
(a)find teh speed of a object at t=3s and confirm algebraically

anonymous · Answer

well it gives us the change in y and time in the equation so plug in 3 for t and solve

anonymous · Answer

after that you have the distance the object fell

anonymous · Answer

and we know speed is distance over time so we just take the distance that we solved for and place it over the time and we have the object's speed

anonymous · Answer

so 16*9=?

anonymous · Answer

144
and divided by 3 is 48
that's not the answer though. it's 96. twice the amount of 48

anonymous · Answer

I could take derivative but my teacher doesn't want us to do that yet

anonymous · Answer

that is very odd I don't know what to say

anonymous · Answer

it works with the derivative yes but not by just plugging it in