Practice question

Given: A hole is made 1.2 m below the surface of a tank open to the atmosphere. What is the efflux speed? (Take g = 9.8 m/s² ) These values define the system as per NCERT data. Formula: Torricelli’s law: v = sqrt2 g h. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: g = 9.8 m/s², h = 1.2 m . v = sqrt2 × 9.8 × 1.2 = sqrt23.52 approx 4.85 m/s . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.