Projectile motion practice exam problem

[ghettobacon]

I cannot for the love of god figure out to do this projectile motion problem, the first problem on this practice exam. Our professor for whatever reason decided not to give a solution page. Somebody PLEASE explain the first problem to me...and if youre feeling brave itd be nice if you could do a few of the others.

I uploaded the pdf to sharebeast, the link is here http://www.sharebeast.com/ozpiopxlfzg6

edit: didnt realize you can just add attachments on here, so i did

 

[Pengwuino]

Well, since this isn't "Do Your Homework For You.com", you'll need to actually show some work first. That is a simple projectile motion problem, you must have some idea on how to do it.

 

[ghettobacon]

sorry I didnt imply it to be that, i just assumed I did this problem completely wrong.. well this is how I did it

method1:

i used rho= (v_final)^2/a_normal where rho is the radius of curvature and v_final would be at the top of the arc. plugging in, rho=7.5 m, a_normal=10 g/s^2 giving you v_final=sqrt(75)

applying v_final= v_o + at, in th x direction gives sqrt(75) = v_o*cos(30) which would mean v_o = 10 m/s

is this correct?

 

[vela]

Yes, that's correct.