We're doing test corrections for my physics class. I did really well, however there were three questions that I had no idea how I was supposed to solve. here are the pesky critters that landed me an A-. :grumpy: : On this one, I guessed. I had and have absolutely no idea as to how in the world I'm supposed to do this. on the other two, I at least had some idea. so, can some one show me how to do this? thank you!!