Question

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

Answer 1

It's -5 right?

Answer 2

s(t) = -9 - 5t <---- to get the derivative for that, you can just use the power rule

so yeap, the derivative is -5

so s'(t) = -5 now setting t = 4 won't make any difference because the derivative is a constant, so is ends up at -5 :)

Answer 3

thanks

Answer 4

yw