Question

how can we find velocity from a displacement time graph

Answer 1

help of time graph........

Answer 2

Just find out the slope.

In case you don't know how to find the slope,

V=(S2-S1)/(T2-T1)

where,
V=velocity between two given points

S1=initial displacement,

S2=final displacement,

T2=final time,

T1=initial time.
hope it will help u.

The same procedure is used as given in above diagram