The instantaneous velocity of a body can be measured
The instantaneous velocity of a body can be measured
Graphically
Vectorially
By speedometer
(a) and (c)
The instantaneous velocity of a body can be measured
The tangent to a curve at any instant on $x$ $-t$ graph gives the instantaneous velocity of the body.
Speedometer reads the velocity of the body at every instant. Thus the instantaneous velocity of the body can be measured by both graphically and by speedometer.