Question

What portion of the graph a show that the Motion of the car non uniform

Answer 1

non uniform motion of the car graph is curve

Answer 2

For displacement-time graph (s-t graph)
graph with a slope up = car moving to the right with uniform speed 
graph with a slope down = car moving to the left with uniform speed 
graph with a slope up with gradient increasing = car moving to the right with accelerating 
graph with a slope down with gradient increasing = car moving to the left with accelerating 
graph with a slope up with gradient decreasing = car moving to the right with accelerating and then decelerate 
graph with a slope down with gradient decreasing = car moving to the left with accelerating and then decelerate 

For velocity-time graph(v-t graph)
graph with a slope up = car accelerating 
graph with a slope down = car decelerating 
graph with a slope up under y-axis but= car accelerating to the opposite(positive) site
graph with a slope up under y-axis but= car accelerating to the negative site