tarzan tries to cross a river by swinging from one bank to the other on a vine that is 10.0 m long. his speed at the bottom of the swing, just as he clears the surface of the river, is 8.0 m/s. tarzan does not know that the vine has a breaking strength of 1.0 x 10^3 n. what is the largest mass tarzan can have and make it safely across the river?

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's.