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  1. If the half-life of a material is 10 yr, then in what time, it becomes 1/4th part
  2. Two springs with spring constants K₁=1500 N/m and K₂=3000 N/m
  3. A projectile is fired at 30°. Neglecting friction, the change in kinetic energy when
  4. The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc
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