Question

How many 2.5kg bricks can a man carry up a staircase 3.6m high in one hour if he works at the average rate of 9.8W
1)800
2)200
3)600
4)400

Answer 1

$\large\bf\implies\: n=?$

$\large\bf\implies\:m=2.5\:kg$

$\large\bf\implies\:h=3.6\: m$

$\large\bf\implies\:\:1\: hour=\: 60×60\:sec$

$\large\bf\implies\:p=\:9.8 \:wat$

$\large\sf\implies\: p\:=\frac{m\:g\:h}{t}$

$\large\sf\implies\:p\:=\frac{nmgh}{t}$

$\large\sf\implies\:h\:=\frac{\:9.8×60×60}{2.5×9.8×3.6}$

$\large\bf\implies\: =\:400\:$