Question

The displacement (in meters) of a particle moving in a straight line is given by s = t^2–9t + 17. Find the instantaneous velocity when t = 4?

Answer 1

differentiate it.. and put t=4

Answer 2

-1

Answer 3

ds/dt=2t-9
now,when t=4,
2*4-9=ds/dt
-1=velocity