一道简单的英文AP物理题

Peter and Josh are skateboarding in a large semicircular halfpipe.Peter starts out from rest at a height h and collides with Josh standing at the bottom.Peter and Josh have about the same mass.After the collision,which height will Josh reach?Let's neglect friction and consider the following two extreme cases: 
The collision is totally inelastic. 
h/25 
 h/16 
h/8 
 h/4 
 h/2 
 h 
None of the above. 

The collision is elastic. 
 h/25 
 h/16 
 h/8 
 h/4 
 h/2 
 h 
 None of the above. 

   

Later that day,Peter does the same thing with Fred,who is 4 times heavier than Peter.If the collision is totally inelastic,what height does Fred reach? 
 h/25 
 h/16 
 h/8 
 h/4 
 h/2 
 h 
 None of the above.