How to Determine Velocities After a Collision in a Physics AP Mechanics Problem?

[apchemstudent]

Alright... After a lot of work, this is what I got:
immediately after the collision:
speed of ball: 2.4m/s
speed of cube: 2m/s (going to the right---the same direction as the ball*)

I then gathered that 153.6 Joules of kinetic energy was lost in the collision...

How does that all sound? (especially the direction of the ball??)

everything looks perfect...

 

[physicsgirl101]

Yay! I'm so excited, thank you, everyone!

 

[physicsgirl101]

there was another part of the question which asks the distance between the two spots of initial impact on the ground (cube and ball)... if anyone cares to do it... i got 4.178 meters-----anyways, I am glad to be done, thanks for all the clarifications!