The speed-time graph shows the velocity of a car for the first 10 seconds after it starts moving. The speeds at 2-second intervals are 0 m/s, 6.4 m/s, 10.2 m/s, 12.8 m/s, 14.6 m/s, and 15.6 m/s.
a.[3]
Use 5 strips of equal width to find an estimate for the distance travelled in 10 seconds.
b.[1]
Is your answer to (a) an underestimate or an overestimate of the actual distance? Give a reason for your answer.