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Answer:
only option A is correct
Explanation:
so final velocity = 15+(7.5)(5) = 52.5 m/s (at the end of the race
and since he started from initial velocity 0 and sped up to 54km/h or 15m/s in 3 seconds in the first half, his acceleration has to be 15-0/3 or 5m/s/s
and so the distance covered will be
u = 0
v = 52.5
t = 8
average a = 5+7.5/2 = 6.25
therefore s = 6.25 × 64 or 400 meters
he also finsihes the race with 52.5 × 18/5 = 189km/h
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