about kinetic and potential Energy: PEAtTheTOP=KEAtTheBottom - i do understand that, but have a question, will it be right(or when it will be right) for this to energy at the middle of height?

Question

anonymous · Answer

to the any point of the motion, you should apply PE+ KE = PE'+ KE'
 It's correct for any point.
specifically at top and bottom, just because at top, there is no moving, so KE =0 and at the bottom, there is no high, PE=0; We have PE = KE . Actually, that KE is KE'  |dw:1384115737317:dw|