What is the minimum speed must a salmon jumping at an angle of 35.2 leave the water in m/s?

Height of the waterfall is 0.449 m

its horizontal distance will be 2.1 m

now let say his speed is v with which he jumped out so here the two components of his velocity will be

here the acceleration due to gravity is 9.81 m/s^2 downwards

now we can find the time to reach the other end by y direction displacement equation

also from x direction we can say

now we have

we will plug in this value into first equation

now as we know that

t = 0.63 s

so his minimum speed of jump is 4.1 m/s

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