How do your measured and calculated values for the unknown distance compare? If there is a large discrepancy, why do you think it occurred?

newton's first law of motion

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

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft