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