• # question_answer    A uniform triangular wedge of mass M is kept on smooth horizontal surface. A horizontal force F is applied on the wedge, then net force on the upper portion ABC is (AB = l/2 and neglect any effect of rotation) A) F/4 B) F/3                  C) F D) 2F

 $M\propto \frac{1}{2}{{l}^{2}}$ Mass of ABC   $m\propto \frac{1}{2}\frac{{{l}^{2}}}{4}$              ;$m=\frac{M}{4},$   $F=Ma$ $F\,\,on\,\,ABC\,\,=\frac{M}{4}a=F/4$ $\therefore$ Ans. [A].