Tomb Raider: Legend Q&A

how do you get the 3rd ball dwn in paru

in the boulivia section, theres a bit where lara is trapped in a room and she has to move 3 boxes over top of buttons and two of the boxs are stuck down on the lower ground. yeah what do you do there ?

When swinging the giant electroballs at Tesla's machine, The beast keeps knocking me down. My guns seem to be of no help. What do I do?