1. The problem statement, all variables and given/known data Jin is sitting on top of a hemispherical, frictionless igloo of radius 2.40 meters. His friend pushes him, giving him an initial speed. Jin slides along the igloo and loses contact with it after he has traveled 1.60 meters along the surface. What was his initial speed? 2. Relevant equations KEi+PEi=KEf+PEf Ei=Ef F=macos(angle) Work=KE+PE Work=Fx(delta x) S=(angle)(radius) PE=mgh KE=.5(m)(v^2) 3. The attempt at a solution I drew a picture of a semicircle and used the S=theta(r) equationand trignometry to find that the hieghts (2.40m initial and 1.89m when leaves igloo). I used the conservation of energy to find that the velocity when Jin leaves the igloo is 3.16m/s. How would I find the initial velocity?