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  1. A ball moving with velocity 2 m/s collides head on with another stationary ball
  2. A source of sound and a detector are moving along the same line with same speed
  3. A boy standing at top of a tower of 20 m height drops a stone
  4. Calcium plate has a maximum possible radiation wavelength 400 nm to eject electrons.
  5. A man weighing 60 kg climbs a staircase carrying a 20 kg load on his hand