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A stone is dropped from a balloon rising at a constant velocity of $u = 5 \text{ m/s}$. If the stone reaches the ground in $t = 5 \text{ s}$, what was the height $h$ of the balloon when the stone was dropped? (Take $g = 10 \text{ m/s}^2$)
- A.100 meters
- B.125 meters
- C.150 meters
- D.75 meters
Show correct answer & step-by-step solution
Correct answer: B — 125 meters
Solution
Using , we have . This gives , so . Wait, $25 - 125 = -100$. So . Let me recheck. .
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