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A staircase h...

Question

A staircase has $40$ steps each of width $35 c m$ and height $25 c m$ .A boy of mass $20 k g$ ascends the staircase.The work done by him is (taken $g = 10 m s^{- 2})$

2 \times 10^{5} J

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4.8 \times 10^{3} J

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2 \times 10^{3} J

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4.8 \times 10^{5} J

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Solution

The correct option is C $2 \times 10^{3} J$
$W o r k d o n e = F o r c e \times d i s p l a c e m e n t$ .
$d = 40 \times 25 c m = 1000 c m$
$F = 20 \times 10 = 200 N$
$W = 200 N \times 10 m$
$= 2 \times 10^{3} J$

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A staircase has 40 steps each of width 35cm and height 25cm.A boy of mass 20kg ascends the staircase.The work done by him is (taken g=10ms−2)

The correct option is C 2×103JWorkdone=Force×displacement.d=40×25cm=1000cmF=20×10=200NW=200N×10m=2×103J

A staircase has $40$ steps each of width $35 c m$ and height $25 c m$ .A boy of mass $20 k g$ ascends the staircase.The work done by him is (taken $g = 10 m s^{- 2})$

The correct option is C $2 \times 10^{3} J$
$W o r k d o n e = F o r c e \times d i s p l a c e m e n t$ .
$d = 40 \times 25 c m = 1000 c m$
$F = 20 \times 10 = 200 N$
$W = 200 N \times 10 m$
$= 2 \times 10^{3} J$