Question

$\sf{Answer \: only \: if \: you \: know}$
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Answer 1

Explanation:

Given,

Time period, dt = 30min= 1800sec

Initial velocity, v1= 30km/h =30 × 5/18

= 50 / 6 = 8.3m/s

Final velocity ,v2 = 40km/h = 40 × 5/18

= 11.11m/s

Vav = ds/ dt

Vav = 11.11 - 8.3/1800

Vav = 2.81 / 1800

Vav = 0.00156m/s