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[" A block of mass "10kg" ,moving in "x"...

[" A block of mass "10kg" ,moving in "x" -direction with a "],[" constant speed of "10ms^(-1)," is subjected to a retarding "],[" force "F=0.1xJm^(-1)" during its travel from "x=20m],[" to "30m." Its final KE will be "quad " [CBSE AIPMT "2015]],[" (a) "475Jquad " (b) "450Jquad " (c) "275Jquad " (d) "250J]

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