The total and effective s tress at a depth of 5 m below the top level of water in a swimming pool are represecitvely

- 1
  
  zero and zero
- 2
  
  $0.5 k g / c m^{2} a n d z e r o$
- 3
  
  $0.5 k g / c m^{2} a n d 0.5 k g / c m^{2}$
- 4
  
  $1.0 k g / c m^{2} a n d 0.5 k g / c m^{2}$

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