Answer :
See the attachment. In the graph, velocity vs time is plotted for t=0 to t=10s.
since v = u+at, the slope is equal to acceleration which is 9.8 m/s².
At t=4s, the velocity is 39.2 m/s. see the velocity corresponding to t=4s.
since v = u+at, the slope is equal to acceleration which is 9.8 m/s².
At t=4s, the velocity is 39.2 m/s. see the velocity corresponding to t=4s.