A man weighing 60 kg climbs up a staircase carrying a load of 20 kg on his head. The staircase has 20 steps each of height 0.2 m . If he takes 10 s to climb, find his power.

Question

A man weighing 60 kg climbs up a staircase carrying a load of 20 kg on his head. The staircase has 20 steps each of height 0.2 m . If he takes 10 s to climb, find his power. (A)  313.6 W  (B)  120.6 W  (C)  510 W  (D)  0

Tardigrade Admin · Accepted Answer

Here, m = 60 + 20 = 80 kg h = 20 × 0.2 = 4 m , g = 9.8 ms-2 , t = 10 s P = (W/t)= (mgh/t) = (80 × 9.8 × 4/10) = (3136/10) = 313.6 W

Q. A man weighing $60 k g$ climbs up a staircase carrying a load of $20 k g$ on his head. The staircase has $20$ steps each of height $0.2 m$ . If he takes $10 s$ to climb, find his power.

$313.6 W$

$120.6 W$

$510 W$

$0$

Here, $m = 60 + 20 = 80 k g$
$h = 20 \times 0.2 = 4 m$ , $g = 9.8 m s^{- 2}$ , $t = 10 s$
$P = \frac{W}{t} = \frac{m g h}{t}$
$= \frac{80 \times 9.8 \times 4}{10} = \frac{3136}{10}$
$= 313.6 W$

Q. A man weighing 60kg climbs up a staircase carrying a load of 20kg on his head. The staircase has 20 steps each of height 0.2m . If he takes 10s to climb, find his power.

313.6W

120.6W

510W

0

Here, m=60+20=80kg h=20×0.2=4m , g=9.8ms−2 , t=10s P=tW​=tmgh​ =1080×9.8×4​=103136​ =313.6W

Q. A man weighing $60 k g$ climbs up a staircase carrying a load of $20 k g$ on his head. The staircase has $20$ steps each of height $0.2 m$ . If he takes $10 s$ to climb, find his power.

$313.6 W$

$120.6 W$

$510 W$

$0$

Here, $m = 60 + 20 = 80 k g$
$h = 20 \times 0.2 = 4 m$ , $g = 9.8 m s^{- 2}$ , $t = 10 s$
$P = \frac{W}{t} = \frac{m g h}{t}$
$= \frac{80 \times 9.8 \times 4}{10} = \frac{3136}{10}$
$= 313.6 W$