Work and Kinetic Energy Problem

[physicsbooks]

Work and Kinetic Energy Problem...URGENT

Homework Statement

Two circus performers, Jack and Jill, whose total mass is 120kg, start a swing which is 5.0 m long such that initially the rope attached to their swing makes an angle of 36 degrees with the horizontal. At the bottom of the arc, Jack, who’s mass is 65 kg, steps of. What is the maximum height of a landing ramp that Jull can reach as the swing continues?

Homework Equations

The Attempt at a Solution

I got 1.469463131 but really I am unsure of whether it is correct.

 

[azicker93]

If they are on a swing wouldn't the angle be with the vertical?

assuming it is the angle with the vertical the first step would be finding potential energy.

$$Pe = mgh$$ the height would be $$5 - 5cos(36)$$

 

[kariijanii]

i have the same problem for homework but can you explain how you got your answer?