6. A person weighs 764 N on the surface of Earth and 5320 N on the surface of another planet. What is the acceleration due to gravity on the other planet?
7. A person is standing motionless between a straight highway and an airport runway. A truck drives by the person at constant speed, while an airplane accelerates down the runway for take off. Of the person, truck, and airplane, which are an inertial frame of reference?