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  1. An object of mass 3kg is at rest. Now a force F=6t² i⃗+4t j⃗ is applied on the object
  2. Two closed organ pipes when sounded simultaneously give 4 beats/second.
  3. A boat taken 2h to travel 8km and back in still water.If the velocity of water 4 km/h
  4. An electron revolves in a circle at the rate of 10¹⁹ rounds per second.
  5. The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol.