A ball of mass 2kg is thrown from a tall building with velocity, v=$ (20 m/s)\hat{i}+(24 m/s)\hat{j}$ at time t=0 s. Change in the potential energy of the ball
after, t=8 s is ( The ball is assumed to be in air during its motion between 0s and 8 s , $\hat{i}$ is along the horizontal and $\hat{j}$ is along the vertical direction. (Take $g=10 m/s^{2}$)