Question

The position of an object at time t is given by s(t) = -9 - 3t. Find the instantaneous velocity at t = 8 by finding the derivative.

Answer 1

so what is the derivative of -3t - 9 ?

Answer 2

Here when we take the derivative of s.........
ds/dt=0-3*1=-3
Hence velocity is a constant ,does not depends on time t