A particle of mass 10 g moves in a straight line with retardation 2x, where x is the displacement in SI units. Its loss of kinetic energy for above displacement is 
. The value of n wil1 be_________•
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(2)
Acceleration can be written as, 
Given: a = - 2x(-ve sign is due to retardation)
Therefore,
Integrating both sides, we get
Hence, n = 2.
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