Two monkeys A and B are holding on the two sides of a light string passing over a smooth pulley. Mass of the two monkeys are ${\mathrm{m}}_{\mathrm{A}}=8\mathrm{kg}\text{ and }{\mathrm{m}}_{\mathrm{B}}=$$10\mathrm{kg}\text{ respectively }\left[\mathrm{g}=10\mathrm{m}/{\mathrm{s}}^2\right]$
 Monkey A holds the string tightly and B goes down with an acceleration ${\mathrm{a}}_{\mathrm{r}}=2\mathrm{m}/{\mathrm{s}}^2$ relative to the string. Find the weight that A feels of his own body.