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  1. A boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat
  2. The velocity of radio-waves is 3×10⁵ km/s. The frequency corresponding to wavelength
  3. A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N
  4. A uniform chain of length L and mass m is kept on a smooth table. It is released
  5. Two charges each equal to 2µ C are 0.5m apart. If both of them exist inside vacuum