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2014-10-09T23:38:12+05:30

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Work done is =
      Volume of water pumped at a constant pressure * constant excess pressure over atmospheric pressure

P = excess pressure = 2 * 10⁵ N/m² - 1 * 10⁵ N/m² = 1 * 10⁵ N/m²
Volume of water pumped = V2 - V1 = V = 4 m³ 

W = P * V = 1 * 10⁵ N/m² * 4 m³ = 400 kJoules 

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