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A coin and a piece of paper are dropped simultaneously from the same height. Which of the two will touch the ground first? What will happen if the coin and the piece of paper are dropped in a vacuum?
Give reasons for your answer.
a. Define buoyant force.
b. An object weighs 500  g in air. This object is then fully immersed in water. State whether it will weigh less or more in water. Justify your answer.

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