During a test on Mars, a lander's crane raises an instrument box of mass 5.0 kg through a vertical height of 2.0 m. The gravitational potential energy of the box increases by 37 J. What is the gravitational field strength on Mars?
7.4 N/kg7.4\ \mathrm{N/kg}7.4 N/kg
18.5 N/kg18.5\ \mathrm{N/kg}18.5 N/kg
0.27 N/kg0.27\ \mathrm{N/kg}0.27 N/kg
3.7 N/kg3.7\ \mathrm{N/kg}3.7 N/kg