A box sitting still on the ground by itself has a Normal Force of 980N, what is the mass? (gravity's acceleration is -9.80 m/s^2 or 9.80 m/s^2 downwards) ​

Which statement best describes how private industry decides where to spend the money on research and development

How would doubling the made of an object change the objects potential energy

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)