The position of an object at time t is given by s(t) = -9 - 5t. Find the instantaneous velocity at t = 4 by finding the derivative

Question

karim728 · Answer

first derivative is the velocity

chelsmae1998 · Answer

what do i do after that

solomonzelman · Answer

Similar problem; Example.
    The position of an object at time t is given by s(t) = -10 + 8t.
    Find the instantaneous velocity at t = 2 by finding the derivative.

Solution:
    The derivative of the position is velocity. (If you want to know why, just ask.)
    The derivative of the position function $s(t)$ is: $s'(t)=8$  (or $v(t)=8$).

    Notice that for any value of $t$, your velocity is constant (it's 8).
    So, the velocity at t=2 is also 8.

solomonzelman · Answer

if you have any questions; ask ...

chelsmae1998 · Answer

i understand now thanks!

solomonzelman · Answer

yw