Physics Question MOtion?

[Lee R]

When a world-class pole-vaulter is gliding over the pole, the jumper is approximately 5.5m above the top of the mat where the jumper will land. Assuming that the jumper's initial vertical velocity is zero at the top of the jump, with what vertical velocity does the jumper strike the mat? Neglect any sideways motion. Can anyone show me how to solve this? Thanks a lot.

 

[Paulie Walnuts]

use the equation vf^2=vi^2+2gh
since vi is zero we can eliminate it so
vf=sqrt(2gh)
vf=SQRT(2(9.81)(5.5))
vf=10.39m/s

 

[akm69]

v^2 = u^2 + 2gs
=>v^2 = 0^2 + 2 x 9.8 x 5.5
=>v^2 = 107.8
=>v = sqrt 107.8 = 10.38 m/s