To determine which graph shows a car moving with constant speed, look for a graph with a straight line (linear) that indicates a constant distance traveled per unit of time.
- Graph A: If it shows a straight line at a certain slope (positive or negative), it indicates constant speed.
- Graph B: If it curves or shows changes in slope, it indicates acceleration or deceleration, meaning the speed is not constant.
- Graph C: If it has breaks or fluctuates in distance over time, it shows the speed is changing.
- Graph D: Similar to B and C, if it curves or is not straight, it indicates varying speed.
So, the correct answer will be the one with a straight line. Without seeing the actual graphs, it's impossible to definitively say which one is correct. Choose the graph with a straight line.