JEE Main Physics question
A river of salty water is flowing with a velocity 2 ms⁻¹. If the density of the water is 1.2 g/cc, then the kinetic energy of each cubic metre of water is
Answer: (C)
Solution
Mass of 1 m³ = 1.2×10³ kg. KE = ½mv² = ½(1.2×10³)(2²) = 2.4×10³ J = 2.4 kJ.