From the given displacement time graph,calculate:(1) velocity between 0-4 s (2) velocity between 4-6 s (3) velocity between 6-9 secs (4)average velocity between 0-4s,0-6s,0-9s ?

Dear student,
(i) velocity in 0 to 4 sec = Displacement/time
=$8/4=2m/s$
(ii) velocity between 4 to 6 sec is zero as there is no displacement or the body is stationary.
(iii) velocity between 6 to 9 sec will be

(iv) average velocity = total displacement/ total time
for 0 to 4sec =$8/4=2m/s$
for 0 to 6 sec =
for 0 to 9 sec =$14/9=1.55m/s$$14/9=1.55m/s$

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nicc question
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Velocity between 0 to 4 secs. Is 2m/s as velocity is the slope of velocity time graph in this case which is 8-0/4 = 2.
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