Ok I got most of them but am having trouble on a few of them. The question is: The Sojourner rover vehicle shown in the sketch above was used to explore the surface of Mars as part of the Pathfinder mission in 1997. Use the data in the tables below to answer the questons that follow. Mars Data: Radius: 0.53 X Earth's radius (Earth radius: 6.37E6) Sojourner Data: Mass of Sojourner vehicle: 11.5 kg Mass: 0.11 X Earth's mass (Earth mass: 5.98E24) Wheel diameter: 0.13 meters Stored energy available: 5.4 x 10E5 J Power required for driving under average conditions: 10 W Land speed: 6.7 x 10E-3 m/s A. Determine the acceleration due to gravity at the surface of Mars in terms of g, the acceleration due to gravity at the surface of Earth. I got 3.8 M/S B. Calculate Sojourner's weight on the surface of Mars. I got 3.02 C. Assume that when leaving the Pathfinder spacecraft Sojourner rolls down a ramp inclined at 20 degrees to the horizontal. the Ramp must be lightweight but strong eough to support Sojourner. Calculate the minimum normal force that mus be supplied by the ramp. I got 41 <-- not sure having trouble with: D. What is the net force on Sojourner as it travels across the Martian surface at constant velocity? Justify your answer. E. Determine the maximum distance that Sojourner can travel on a horizontal Martian surface using its stored energy. F. Suppose that 0.010% of the power for driving is expended against atmospheric drag as Sojourner travels on the Martian surface. Calculate the magnitude of the drag force. Any help is appreciated. EDIT: I cant fix it, Wheel diameter: 0.13 meters Stored energy available: 5.4 x 10E5 J Power required for driving under average conditions: 10 W Land speed: 6.7 x 10E-3 m/s are under Sojourner Data.