text: Theoretically, assuming it was possible, the object would oscillate, with an ever decreasing amplitude, due to the conservation of energy. The man would jump in and fall right through, past the middle and towards the otherside of the earth, but would not 'shoot out' of the otherside, because energy would be used overcoming the frictional forces (air resistance) hence he would oscillate with an ever decreasing amplitude until he is finally stationary, where he/it would stay forever. Such motion would be described as damped harmonic motion.