1. The problem statement, all variables and given/known data While standing on frictionless ice, you (mass 65.0 kg ) toss a 4.50g rock with initial speed 12.0m/s . The rock is 15.2 m from you when it lands. Take the axis on the ice surface in the horizontal direction of the motion of the rock. Ignore the initial height of the toss. At what angle did you toss it? How fast are you moving? (cm/s) 2. Relevant equations trajectory equation r=(vo²/g)sin2theta m1v1+m2v2=0 3. The attempt at a solution I solved for theta, and got theta=(1/2) sin-1(gR/v²) but that's giving me sin-1(1.03) obviously something is wrong. please help! And for the 2nd part, would you just do m1v1+m2v2cos(theta from part a)=0 ??