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When a stone is falling from a mountain its u=0 and acceleration due to its gravity is 9.8m/sec²

velocity of ston is given as 9.8t draw its graph and find velocity of stone 4 sec after the start



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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.
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