As a fish jumps vertically out of the water, assume that only two significant fo

Question

As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 45.0 kg. If this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 4.70 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine the following.

(a) the salmon's acceleration

.......... m/s2 upward

(b) the magnitude of the force F during this interval

...........N

Explanation / Answer

a) V2 - U2 =2aS

=> 4.72 - 32 = 2(a)(2/3*1.5)

=> a= 6.545 m/s^2

b) F-mg/m = 6.545 => F = 735.5 N

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