Q.
The mass of a uniform ladder of length 5 m is 40 kg. A person of mass 80 kg stands on the ladder at a height of 2 m from the bottom. The position of centre of mass of the ladder and man from the bottom nearly is
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a
1 m
b
2.5 m
c
3.5 m
d
2.16 m
answer is D.
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Detailed Solution
ycm=m1y1+m2y2m1+m2 ycm=40×2.5+80×240+80 =100+160120=260120 =2.16
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