Physics Question from JEE Main 2026 · 24 January, Shift 1

Density of water at $4^\circ\text{C}$ and $20^\circ\text{C}$ are $1000\,kg/m^3$ and $998\,kg/m^3$ respectively. The increase in internal energy of $4\,kg$ of water when it is heated from $4^\circ\text{C}$ to $20^\circ\text{C}$ is _____ $\text{J}$.

(Specific heat capacity of water $= 4.2\,J\,g^{-1}K^{-1}$ and atmospheric pressure $=10^5\,Pa$)