A daring 510-N swimmer dives off a cliff with a running horizontal leap. What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?

Answer 1

I do not care if she is thin or fat.

falls 9 meters, how long?
h= (1/2) g t^2
18 = 9.8 t^2
t = 1.36 falling

goes 1.75 meters horizontal in 1.36 seconds

1.75 = u t = u (1.36)
u = 1.29 m/s horizontal speed