The animation here shows Jerry driving towards some cheese. The entire journey lasts 10 seconds. And Jerry covers 50 m in that time.

If you break up the journey, Jerry covers 5 m in the first 2 s, 10 m in the next 2 s and so on. So, in the first 2 s, the average speed is \(\frac{5 \, \mathrm{m}}{2 \, \mathrm{s}} = 2.5 \, \mathrm{m/s}\). In the next 2 s, the average speed is is \(\frac{10 \, \mathrm{m}}{2 \, \mathrm{s}} = 5 \, \mathrm{m/s}\)

If you break up the journey, Jerry covers 5 m in the first 2 s, 10 m in the next 2 s and so on. So, in the first 2 s, the average speed is \(\frac{5 \, \mathrm{m}}{2 \, \mathrm{s}} = 2.5 \, \mathrm{m/s}\). In the next 2 s, the average speed is is \(\frac{10 \, \mathrm{m}}{2 \, \mathrm{s}} = 5 \, \mathrm{m/s}\)

Jerry covered (i) 5 m from 0 to 2 s, (ii) 10 m from 2 to 4s and (iii) 20 m from 4 to 6 s. Which of these has the highest average speed?

Time interval (i)

Time interval (ii)

Time interval (iii)

All had equal average speeds