Question

19. Speed is O A. Distance travelled-time O B.Time=distance travelled O C. Distance travelledxtime O D. timexdistance travelled​

Answer 1

Explanation:

Expression for velocity:

v= ds/dt

v= d/dt (2.5m/s^2)t^2​

v= (5m/s^2)t

(a) Average speed from 0 to 5 sec= (2.5m/s^2)t^2 = (2.5m/s^2) (5s)^2 =62.5m

Average speed:

v= total distance travelled/total time

v= 62.5/5

v= 12.5m/s

(b) Speed at t=5 sec

v=(5m/s^2)t

v=(5m/s^2)(5s)

v=25m/s