An object starts from rest at a height of 7.5 m and slides down to the bottom of a hill. determine how fast the object is going at the bottom of the hill. assume no thermal energy is generated and express your answer using appropriate mks units. round your answer to the nearest thousandth. part b now assume that the object is a hollow sphere and instead of sliding down the hill, it rolls down the hill. it still starts from rest at a height of 7.5 m. determine how fast it will be going at the bottom of the hill. assume no thermal energy is generated and express your answer using appropriate mks units. round your answer to the nearest thousandth object moment of inertia formula hollow cylinder 1mr2 solid cylinder 1 2 mr2 hollow sphere 2 3 mr2 solid sphere 2 5 mr2