2003 CAIE AS & A level May June Physics Paper 01 Q. No. 10 (9702/01/M/J/03) by Sajit Chandra Shakya from Nepal Chapter - DYNAMICS and FORCES Two blocks X and Y, of masses m and 3m respectively, are accelerated along a smooth horizontal surface by a force F applied to block X as shown. What is the magnitude of the force exerted by block X on block Y during this acceleration?