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BITSAT 2021
Exam
BITSAT
Year
2021
Subject
Physics
Chapter
Motion in One Dimension

BITSAT 2021 · Physics · Motion in One Dimension

A balloon is rising vertically up with a velocity of 29 ~ms^ -1 . A...

A balloon is rising vertically up with a velocity of 29 ms−129 \mathrm{~ms}^{-1}. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it, was (g=9.8 ms−2)\left(\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right)

Options

  1. A100m100 \mathrm{ m}
  2. B200m200 \mathrm{ m}
  3. C400m400 \mathrm{ m}
  4. D150m150 \mathrm{ m}

Correct answer

B. 200m200 \mathrm{ m}

Step-by-step solution

For stone to be dropped from rising balloon of velocity 29m/s,u=−29m/s,t=10sec⁡.29 \mathrm{ m} / \mathrm{s}, \mathrm{u}=-29 \mathrm{ m} / \mathrm{s}, \mathrm{t}=10 \mathrm\sec .∴h=−29×10+12×9.8×100=−290+490=200m.\begin{array}{l} \therefore \mathrm{h}=-29 \times 10+\frac{1}{2} \times 9.8 \times 100 \\ =-290+490=200 \mathrm{ m} . \end{array}$$
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