5 Missy Diwater, the former platform diver for the Ringling Brother's Circus had a KE of 15,000 J just before hitting the bucket of water. If Missy's mass is 57 kg, then what was her speed? Units Formula, Algebra, Solve 6. The city bus has 290,000 J of KE and moves at 52 km/hr? What is the bus's mass? First- Convert km/hr to m/s (1 km=1000 m) (1 hr= 3600 s) x 1 hr S Units Formula, Algebra, Solve 7. A kid is bored shooting rubberbands at the wall. The rubber band's spring constant is 7.38 N/m. As the kid pulls back on the rubber band it now has 0.23 J of elastic PE. Calculate how far the rubber band was stretched. Units Formula, Algebra, Solve 8. A student is practicing archery. The student pulls the bow back 0.53 m. The bow now has 72.08 J of elastic PE. Calculate the bow's (spring's) constant. Units Formula, Algebra, Solve