9702/12/F/M/23 simple solution by sir saeed Akhtar

9702/12/F/M/23 solved by Sir saeed akhtar A snooker ball of mass 0.20 kg has a collision so that its direction of movement changes by an angle of 90°, as shown. A satellite uses two thrusters to adjust its motion in space. Each thruster exerts a force of 40 N on the satellite. The line of action of each force is a perpendicular distance of 2.3 m from the centre of gravity of the satellite. These two parallelforces act in opposite directions. A probe is used to monitor the quality of the water in the sea. The probe is suspended by a vertical string which is attached to a sphere. The stationary sphere floats in equilibrium on the surface of the sea, as shown. A beam of vertically polarised light is incident normally on a polarising filter. The filter can be rotated so that it is always in a plane perpendicular to the beam. The transmission axis of the filter is initially vertical.