Question

PLEASE HELP!! Salmon often jump waterfalls to reach their

breeding grounds.
Starting downstream, 3.41 m away from a
waterfall 0.397 m in height, at what minimum
speed must a salmon jumping at an angle of
28.4° leave the water to continue upstream?
The acceleration due to gravity is 9.81 m/s2
Answer in units of m/s.

Answer 1

7.13781 m/s

Step-by-step explanation:

X-direction | Y-direction

`x=v_(xo)t+(1)/(2)a_(x)t^2` |
`y=v_(yo)t+(1)/(2)a_(y)t^2`

`3.41=v_(o)cos(28.4)t` |
`0.397=v_(yo)sin(28.4)t+(1)/(2) (-9.81)t^2`

`3.41=v_(o)(0.87964)t` |
`0.397=v_(yo)sin(28.4)((3.87658)/(v_(o) ))+(1)/(2) (-9.81)((3.87658)/(v_(o) ))^2`

`(3.41)/(0.87964)=v_(o)t` |
`0.397=1.84379-(73.71171)/(v^2)`

`(3.87658)/(v_(o) ) =t` |
`7.13781=v`