JEE Main 2022 · 26 Jun · Shift 2, Physics question 51

A ball is projected vertically upward with an initial velocity of 50 ms$^{-1}$ at $t=0$ s. At $t=2$ s, another ball is projected vertically upward with same velocity. At $t=$ ______ s, second ball will meet the first ball ($g=10$ ms$^{-2}$).