Mathematics for IGCSE & O level - Graphs In Practical Situations (Section 4 - No. 29)
The speed-time graph shows the first 30s of a car's journey. What is the speed of the car after 15 seconds?
10.5 m/s
21 m/s
15 m/s
30 m/s
คำอธิบาย
Speed after 15 seconds will be 21 m/s as it travels in a straight line