Physics - NLM Question with Solution | TestHub

A block of mass $m(=0.1\mathrm{kg})$ is hanging over a frictionless light fixed pulley by an inextensible string of negligible mass. The other end of the string is pulled by a constant force $F$ in the vertically downward direction. The linear momentum of the block increases by $2{\mathrm{kgms}}^{-1}$ in $1\mathrm{s}$ after the block starts from rest. Then, (given $g=10{\mathrm{ms}}^{-2}$ )