Which describes the difference between a bowling ball sitting in the rack waiting to be used and the bowling ball knocking pins down? a. in the rack, the bowling ball has only potential energy. as it knocks pins down, its potential energy has decreased, while its kinetic energy has increased. b. in the rack, the bowling ball has no energy at all. as it knocks down the pins the energy is 75% kinetic and 25% potential. c. in the rack and when knocking down pins, the potential energy and the kinetic energy of the bowling ball are equal. d. in the rack, the bowling ball has only kinetic energy. as it knocks pins down, its potential energy has increased, while its kinetic energy has decreased.

Newton's law of cooling states that the rate of change in the temperature t(t) of a body is proportional to the difference between the temperature of the medium m(t) and the temperature of the body. that is, startfraction dt over dt endfraction equals upper k left bracket upper m left parenthesis t right parenthesis minus upper t left parenthesis t right parenthesis right bracket , where k is a constant. let kequals0.04 left parenthesis min right parenthesis superscript negative 1 and the temperature of the medium be constant, m(t) font size decreased by 3 equivalent font size decreased by 3 294 kelvins. if the body is initially at 369 kelvins, use euler's method with hequals0.1 min to approximate the temperature of the body after (a) 30 minutes and (b) 60 minutes.