Physics - NLM Question with Solution | TestHub

Mass of the person $M=80$ kg

Mass of the parachute $m=5$ kg

$\therefore$ Total mass of the system $=M+m=85$kg

Downward acceleration $a=2.8 {\mathrm{m}\mathrm{s}}^{-2}$

Let upward force $=F$

Applying Newton's II law of motion to this system

$F=\left(m+M\right)g-\left(m+M\right)a$

$\mathrm{o}\mathrm{r}\mathrm{ }\mathrm{ }F=\left(m+M\right)\left(g-a\right)$

$F=85\left(9.8-2.8\right)\mathrm{N}$

$=85\times 7\mathrm{ }\mathrm{N}$

$F=595 \mathrm{N}=5.95\times {10}^2 \mathrm{N}$

$k=5.95$