an0nym801

The first part is easy: change in momentum is impulse, which you can find by integrating F from 0 to your time. Now, what about b)?

The same goes for part b), but when you integrate you should start from the time the mass moves. SO change in momentum equal change in impulse only from the time they're moving you find speed and c) is trivial P = F v, both at your final time

@ anonymous aha, you instead were casually around here...

I want to do it by myself (and don't even understand the above) , can someone point me at the right chapter/lecture?

I don't think so. omega comes out too low I think part a) has to be done with energy conservation U at the top - U at 30° = K of rod

guys where did you find those equations, lecture num or book chapt pls?