Answer: 0
Explanation:
75 newtons will push back canceling it out make it 0
Answer:
B
Explanation:
the way to get b you have divion each other
A)Ep'=mgh=mgl(1-cosa).At the bottom of the swing Ep=0(reference level),so the potential energy as the child is just released is bigger than the potential energy at the bottom of the swing.;B)The speed of the child at the bottom of the swing-->v=√(2gh)=√[2gl(1-cosa)];C)I don't think that the tension does any work.