The work done in pulling up a block of wood weighing $2 \,kN$ for a length of 10m on a smooth plane inclined at an angle of $15°$ with the horizontal is ............. $\mathrm{kJ}$
The work done in pulling up a block of wood weighing $2 \,kN$ for a length of 10m on a smooth plane inclined at an angle of $15°$ with the horizontal is ............. $\mathrm{kJ}$
$4.36$
$5.17$
$8.91$
$9.82$
The work done in pulling up a block of wood weighing $2 \,kN$ for a length of 10m on a smooth plane inclined at an angle of $15°$ with the horizontal is ............. $\mathrm{kJ}$
$W = mg\sin \theta \times s$
$ = 2 \times {10^3} \times \sin 15^\circ \times 10$
$ = 5.17\,kJ$