Apenny is dropped into a well. it takes 5 seconds to fall. calculate the depth of the well in feet. a - 400b - 300c - 100

B-300 hope this helps

I believe the answer is A. 400 feet. I attached screen shots of my work. I hope this helps you! If you still have any questions feel free to comment below. 

I know it seems like a lot of work, but once you get used to it, you will be able to do it much more quickly. Physics is something you just need a lot of practice and repetition with. If you practice a lot, then you will have seen problems before and get the equations memorized just by working with them so much. 

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n