If a ball has 100 J of potential energy on the shelf, how much energy does it have if it falls one-fourth of the way down to the ground?

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

answer///terminator or twilight zone;