Ok, so am gonna post 20+ modern physics and mechanics questions, and am hoping you guys can help me with them. I study in university, and was surprised during my vacation by being told that I have a calculus and physics examination in a week. I took care of the calculus part, but I really need help with the physics, so I'll be posting each question, and once a question is answered and explained to me, I'll post the next one. Shall we? All I need is a yes.