~b)  Diagram: 

  Both axes correctly labelled  
  Any correct shape of graph showing acceleration segment 

Acceleration = gradient of AB  
Total distance covered = area under the graph  

(c) Diagram

- At least one axis labelled 
- correct shape of graph  
Let V\(_1\) = maximum velocity after 20 sec.
 V\(_2\) = maximum velocity after 30 sec.
(i) Then  \(\frac{V_1}{20}\)  = 6
 ~(c) Diagram

- At least one axis labelled 
- correct shape of graph  
Let V\(_1\) = maximum velocity after 20 sec.
 V\(_2\) = maximum velocity after 30 sec.
(i) Then  \(\frac{V_1}{20}\)  = 6
 