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Q.

Twenty identical cubical blocks each of mass 100g and of side 10cm are placed one above the other. The potential energy of 15th block from bottom is g=10ms−2

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a

1.5 J

b

1.4J

c

1.3 J

d

1.45J

answer is D.

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Detailed Solution

U15=mgh15=0.1×10×14×10+102×10−2U15=145100=1.45J
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Twenty identical cubical blocks each of mass 100g and of side 10cm are placed one above the other. The potential energy of 15th block from bottom is g=10ms−2