Question

A man weighing 80 kg climbs a staircase carrying
a 20 kg load. The staircase has 40 steps each
of 25 cm height. If he takes 20 seconds to climb,
the work done is
1) 9800 J 2)490 J 3) 98 x 105 J 4) 7840 J


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Answer 1

Answer:

Potential energy=mass×acceleration due to gravity x−height

P.E.=m×g×h

According to the given condition -

m=80+20=100kg

g=9.8m/s

2

h=25×40=1000cm=1m

P.E=Work Done=100×9.8×1=980J

Power is rate of work done =

Time Taken

Work Done

=

20

980

=49J/s=49Watt

Explanation:

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