Shawn and his bike have a total mm of 55.4 kg. Shawn rides his bike 1.5 km in 15.8 min at a constant velocity. The acceleration of gravity is 9.8 m /s2 . What is Shawn's kinetic energy? Answer in units of J. Answer in units of J It takes 5.91 J of work to stretch a Hooke's- law spring 4.66 cm from its unstressed length. How much the extra work is required to stretch it an additional 6.17 cm? Answer in units of J. Answer in units of J