Mathematics for IGCSE & O level - Graphs In Practical Situations (Section 6 - No. 21)
A bus travels 100 meters in 5 seconds, then stops. What is its speed at 2 seconds?
0 m/s
20 m/s
25 m/s
500 m/s
Giải thích
Speed = distance/time. At 2 seconds, the bus is moving at a constant speed before stopping: 100m/5s = 20 m/s.