Salmon often jump waterfalls to reach their breeding grounds. starting 3.15 m from a waterfall 0.45 m in height, at what minimum speed must a salmon jumping at an angle of 33.2 degree leave the water to continue upstream? the acceleration due to gravity is 9.81 m/s2. answer in units of m/s.

Let the salmon jump with speed v at an angle of 33.3 degree

So here we can find out the components of his velocity in x and y direction

now the horizontal displacement of the salmon is 3.15 m so he cover this horizontal distance with constant speed as there is no acceleration in x direction

here we can say

now in Y direction it is an accelerated motion as it is accelerated due to gravity

now we will plug in v*t = 3.76

now speed v is given by equation above

so here he must have to jump with minimum speed of 5.25 m/s

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this