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Q.

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement x is proportional to

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a

x0

b

x2

c

ex

d

x

answer is B.

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Detailed Solution

Loss  of  KE=force×distance=(ma)x=work  done
As, a∝x         ∴  Loss  of  KE∝x2

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