A trolley of mass 0.60 kg starts from rest and descends through a vertical height of 1.5 m. During the descent, 1.5 J is transferred to thermal stores. Use g=10 N/kgg=10\ \mathrm{N/kg}g=10 N/kg. What is the speed of the trolley at the bottom?
5.0 m/s5.0\ \mathrm{m/s}5.0 m/s
4.5 m/s4.5\ \mathrm{m/s}4.5 m/s
5.5 m/s5.5\ \mathrm{m/s}5.5 m/s
25 m/s25\ \mathrm{m/s}25 m/s