$A$ man throws a ball vertically upward and it rises to a height of $20 \; m$ before returning to his hands. What was the initial velocity $(u)$ of the ball and for how much time $(T)$ did it remain in the air? $[g = 10 \; m/s^2]$
- A$u = 10 \; m/s, T = 2 \; s$
- B$u = 10 \; m/s, T = 4 \; s$
- C$u = 20 \; m/s, T = 2 \; s$
- D$u = 20 \; m/s, T = 4 \; s$
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