A 50.0lbm box is being pulled from the bottom of the hill 100ft up a 35∘ incline on the moon. What is the gravitational work? a. 5740ft−lbf b. 473ft−lbf c. 1.85×105ft−lbf d. 3.05×104ft−lbf 156. The area of a 50.0 box that is in contact with the flat ground on the moon is 15 in 2. How much pressure is exerted on the ground by the box? a. 40.7psi b. 3.33 psi c. 3.33lbf/ft2 d. 0.550lbf/ft2 e. 0.550psi 157. If a motor does 3800lbf-ft of work to move a box up an incline at constant speed in 45.0 seconds, how much input power is needed if the motor is 60% efficient? a. 84.45tbf−ft​ b. 50.7ss(bf−ft​​ c. 141stbf−ft​ d. 75.0510f−ft​