Help with iii and iv? The answers are in bold next to the question but I can't figure out these two, exam tomorrow so help would be amazing!

Question

anonymous · Answer

You might want to post the actual question!

anonymous · Answer

It's in the phot attached!

anonymous · Answer

Find the speed of the box when it reaches the bottom of the ramp is the part in asking about

anonymous · Answer

I don't see an attachment :/ can you try reposting it?

anonymous · Answer

Here is the pic again

anonymous · Answer

$\text{iii}).$ We know that initially the box has only potential energy. When it's released from it's height $h$, all that potential energy (in a system where no energy is lost) is completely converted into kinetic energy. Equate those two equations and solve for the velocity.