A man weighing 60 kg climbs a staircase carrying a 20 g load on his hand . The staircase has 20 steps and each step has a height of 20 cm . It he takes 20 second to climb , his power is
Options:
A .  160 w
B .  230 w
C .  320 w
D .  80 w
Answer: Option A
Power = `((60 + 20) xx (10) xx (20 xx 0.2))/(20)` = 160 w
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