Intitial velocity from given angle and distance

[morganm725]

1. An athlete executing a long jump leaves the ground at a 30° angle and travels 8.30 m.
What was the takeoff speed?

Homework Equations

Just the kinematic equations and trig functions.

The Attempt at a Solution

I don't even know where to begin solving the problem. I've tried using half the distance as a measurement but that wasn't correct.

 

[willem2]

whats the height of the athete as a function of time after he takes of?

at what value of t does this height become zero again?

how much has the athlete traveled in that time.

(of course an athlete is a point mass in this kind of problem)

 

[morganm725]

there is no height given, so I assume we ignore the height. The athlete has traveled 8.30m (no time given) and we ignore air resistance and his height.