Question

NEED HELP with velocity

Answer 1

okay whats the question? displacement over time...

Answer 2

i need to find the velocity of a portable at 5 seconds (it's a problem from my textbook)

Answer 3

the average velocity was 80 ft/s

Answer 4

is there an equation?

Answer 5

yeah s = 16 t (exponent 2)

Answer 6

Okay this is the formula for the distance of an object over time so in order to get the speed function from this we have to take the derivative of it

Answer 7

ok good

Answer 8

then just plug in 5 for t and you have the velocity at 5 seconds

Answer 9

but the formula of derivative is f(x+h)- f(x) / h right?

Answer 10

right and f(x)=16t^2 in this case

Answer 11

ohh yeah i understand ! i got it i think thanks sullivan !!!

Answer 12

No problem. Anytime

Answer 13

last question, how do you know that you need to use the derivative when you have a speed equation or something like that?