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[" A body of mass "1kg" begins to move under the "],[" action of a time dependent force "vec F=(2ti+3t^(2)j" t'jm "],[" where hat and j " are unit vectors along " x " and " y " axs " "],[" What power will be developed by the force at the "],[" timet? "],[[" (1) "(2t^(2)+3t^(3))W," (2) "(2t^(2)+4t^(4))W],[" (3) "(2^(3)+3t^(4))W," (4) "(2^(3)+3t^(5))W]]

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