11Dec/09Off
Fishing Air
How high in the air can the fish jump if it leaves the water traveling vertically upwards relative to the Eart?
A Chinook (King) salmon (Genus Oncorynchus) can jump out of water with a speed of 6.30 m/s. If the salmon is in a stream with water speed equal to 1.35 m/s, how high in the air can the fish jump if it leaves the water traveling vertically upwards relative to the Earth?
The acceleration (deceleration in this case) due to gravity is 9.81 meters per second.
The fish starts at 6.30 meters per second.
Therefore it will take 6.30/9.81 = 0.643 seconds to reach zero speed and its highest point.
It starts at 6.3 meters per second and finishes at zero meters per second.
Therefore its average speed on ascent is 6.3/2 = 3.15 meters per second.
Therefore the distance traveled is speed x Time = 3.15 x 0.643 = 2.03 meters.
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