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  1. Two blocks of masses m₁=4 kg and m₂= 2kg are connected to the ends of a string
  2. A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
  3. A body under the action of a force F⃗ = 6i⃗–8j⃗+10k⃗, acquires an accelerationof 1 m/s². The mass of this body must be
  4. The magnifying power of a telescope is 9. When it is adjusted for parallel rays
  5. The mean free path of molecules of a gas,(radius ‘r’) is inversely proportional to