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  1. The angular velocity of second’s hand of a watch is
  2. An experiment takes 10 minutes to raise temperature of water from 0⁰C to 100⁰C
  3. The velocity of a particle at an instant is 10 ms⁻¹ and after 5 s the velocity
  4. When the wave of hydrogen atom comes from infinity into the first orbit,
  5. A source of sound and a detector are moving along the same line with same speed