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  1. Two particles of masses m₁ m₂ move with initial velocities u₁ and u₂
  2. Two bodies A and B have masses 20 Kg and 5 Kg respectively. Each one is acted
  3. An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz.
  4. Astigmatism is corrected by using
  5. The escape velocity from the earth’s surface is 11 kms⁻¹.A certain planet