Dan's Momentum Change: 4m/s to Ground Zero

[trailblaza247]

Homework Statement

dan is gliding on his sb at 4m/s. he suddenly jumps backward off his sb, kicking the sb foward at 8m/s. how fast is dan going as his feet hit the ground? dan's mass is 50kg and the sb's mass is 5kg

Homework Equations

The Attempt at a Solution

 

[mbrmbrg]

Welcome aboard!

Do you have any thoughts on this problem at all? Concepts that may prove useful? Equations that relate what you know with what you're looking for?