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  1. If 20% of a radiactive element decays in 10 days, then amount of original material left
  2. An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m.
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  4. A glass flask weighing 390 g having internal volume 500 cc just floats
  5. Initial angular velocity of a circular disc of mass M is ?￢ﾂﾁ.Then, two small spheres