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Stone dropped from a balloon rising at 10 m/s at 75 m: height of the balloon when the stone lands

The same question, asked 2 times: 2021 Paper 15, 8 Apr 2026 S2. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 15

    1
    A balloon is rising up with constant velocity of 10 m/s10\text{ }m/s. At a height of 75 m75\text{ }m, a small stone is dropped from it. At what height from the ground would the balloon be, when the mass reaches the ground?

  2. Question 2

    8 Apr 2026 S2

    4
    A gas balloon is going up with a constant velocity of 10 m/s10\text{ }m/s. When this balloon reached a height of 75 m , a stone is dropped from it and balloon keeps moving up with the same velocity. The height of the balloon when the stone hits the ground is ____\_\_\_\_ m . (Take g=10 m/s2g = 10\text{ }m/s^{2})

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