Please help me

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2.5kgm"
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HIT LIKE IF U GET IT!!
 
Change in kinetic energy = (1/2)mvf2 - (1/2)mvi2 = (1/2)×0.5×( 202 - 102 ) = 300 J
Workdone by the force = 300 J
Theorem used  is " Work-Energy Theorem "
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