Question

Please explain both the parts​

Answer 1

Step-by-step explanation:

Average speed = Total distance / Total time

(i) Between 4s and 5s,

Distance travelled = 20m

Time taken = 1s

Average speed = 20/1 = 20 m/s

(ii) Between 4s and 7s

Distance travelled = 20m

Time taken = 3s

Average speed = 20/3 = 6.67 m/s