Projectile Motion Problem

[Jordan_]

A ball is thrown upward at an angle 30 degrees above the horizontal and lands on the top edge of a building 20 m away. The top edge is 5m above the throwing point. How fast was the ball thrown?

ANS 20 m/s.

I just can't seem to get this. It looks like there is a piece of info missing but I know that's not the case. Any hints?

[f4d_girl]

there are enough values to solve this problem
you need to calculate horizontal component and vertical component

[discombobulated]

have you tried using v2= u2+2as ? I think rearranging that for u should work.

[f4d_girl]

you've got to compute horizontal and vertical component because the ball was not thrown directly upward.. it was thrown at 30 degrees