A rescue stretcher is held horizontal by two people. Person A supports one end of the stretcher and person B supports the other end, 2.0 m from person A.
The weight of the stretcher is 120 N and acts 1.0 m from person A. A patient of mass 60 kg lies on the stretcher. The patient's weight acts 1.4 m from person A.
Take the gravitational field strength, ggg, as 10 N/kg. All the distances are perpendicular distances from person A to the lines of action of the forces.
Calculate the upward force exerted on the stretcher by person B.