Answer:
a)this graph is also a line   b) in both cases we have a uniform movement
Explanation:
In this exercise we have a uniform movement
   v = d / t
   d = v t
in the table we give some values ​​to make the graph
    t (s)   d (m)
    1     10
    2     20
    3     30
In the attached we can see the graph that is a straight line
we have another vehicle at v = 50 me / S
t (s) Â Â d (m)
1 Â Â Â Â 50
2 Â Â Â Â 100
3 Â Â Â Â 150
this graph is also a line
b) in both cases we have a uniform movement