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Q. A 2.4 kg toy locomotive is pulling a 1.6 kg caboose. The frictional force of the track on the caboose is 0.54N backward all along the track. If the train is accelerating forward at 3 m/s2, what is the magnitude of the force exerted by the locomotive on caboose?

Q. Chromium is produced by responding its oxide with aluminium. If 76g of Cr2O3 and 27g of Al completely react to form 51.0g of Al2O3, how many grams of Cr are formed?

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