A bowling ball of mass 7.25 kg and radius 10.8 cm rolls without slipping down a lane at Calculate its total kinetic energy

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units