The speed of the highest point is 0 m/s,
The wat inlet speed is 20m/s,
Then during this journey (15+ 1= 16m).
The average speed is (0+20)÷2= 10m/s,
So the time for athletes to jump into the water from the highest point is
16÷ 10= 1.6s。
2. The average fall speed of athletes per second is (20-0) ÷1.6 =12.5m/sec.
3. Let the time from the highest point to 6m above the water surface be t, then
〔0+(0+ 12.5t)÷2×t = 15+ 1-6
Find t =1.26s.
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