The appropiate label for the slope in this graph is km/hr/s
answer: km/hr/s
This graph show about the acceleration for the moving obeject that the acceleration is constant, (it is always the same acceleration 6 km/h/s).
acceleration =velocity/time
To compute acceleration we need two points:
(10,60)
(0,0)
aceleration=(60-0)km/h/(10-0)s)=6 km/h/s