From the top of a tower, $80 \ m$ high from the ground, a stone is thrown in the horizontal direction with a velocity of $8 \ ms^{-1}$. The stone reaches the ground after a time $t$ and falls at a distance of $d$ from the foot of the tower. Assuming $g=10 \ ms^{-2}$, the time $t$ and distance $d$ are given respectively by
- A$6 \ s, 64 \ m$
- B$6 \ s, 48 \ m$
- C$4 \ s, 32 \ m$
- D$4 \ s, 16 \ m$
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