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[" 20.A box is placed on the floor of a ...

[" 20.A box is placed on the floor of a truck "],[" moving with an acceleration of "7ms^(-2)" .If "],[" the coefficient of kinetic friction between "],[" the box and surface of the truck is "0.5" ,"],[" the acceleration of the box in ms "^(2)" relative "],[" to the truck is "],[[" I) "1.7,2" ) "2.1," 3) "3.5," 4) "4.5]]

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