Final answer:
A car with positive acceleration will be shown on a velocity-time graph as a line with a positive gradient or on a position vs. time graph as a curve that bends upward, illustrating that the car's velocity is increasing over time.
Step-by-step explanation:
The question relates to the topic of kinematics in Physics, specifically interpreting motion graphs. A car with positive acceleration will be represented by a graph where the velocity increases over time. If we consider the velocity-time graph, this would be depicted as a line with a positive gradient, meaning the line slopes upward as it moves from left to right. This upward slope indicates that the velocity is increasing over each second, which corresponds to positive acceleration. Additionally, in a position vs. time graph, a car with positive acceleration will show a curve that bends upward, indicating that the car is covering greater distances in each successive time interval. Therefore, a car displaying a curved position vs. time graph with increasing slope or a straight-line velocity-time graph with a positive slope would be a car with positive acceleration.