Tossing Rocks on Frictionless Ice: Calculating Angle and Speed

[xXmarkXx]

While standing on frctionless ice, you (mass 65.0 kg) toss a 4.5 kg rock with initial speed 12.0 m/s. IF the rock is 15.2 m from you when it lands, (a) at what angle did you toss it? (b) How fast are you moving?

I'm still having trouble with these.

 

[Luke1294]

https://www.physicsforums.com/showthread.php?t=159042

 

[xXmarkXx]

https://www.physicsforums.com/showthread.php?t=159042

Thank you luke