please check my answers. 17. explain how the sport of pole vaulting dramatically changed when flexible fiberglass poles replaced still wodden poles?-the fiberglass poles had more momentum and PE than still wooden poles?20. does the international space station have gravitational pe? ke? explain?-It has gravitation pe, but I am stuck as to why?25. what does the work theorem say about the speed of a satillite in circular orbit? (this one I dont understand)30.a moving hammer hits a nail and drives it into a wall. if the hammer hits the nail with twice the speed, how much deeper will the nail be driven? if it hits with three times the speed?-would it be three times the speed
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