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Manipal MET2012PhysicsMotion in One Dimension

A balloon is rising vertically up with a velocity of 29 ~ms ⁻¹ . A stone is dropped from it and it reaches the ground in 10 s . The height of the balloon when the stone was dropped from it is ( g =9.8 ~ms ⁻¹ . )

Options

  1. A400 m
  2. B150 m
  3. C100 m
  4. D200 m

Correct answer

D. 200 m

Step-by-step solution

For a stone which is thrown downwards from a balloon rising upwards, the equation of motion is aligned h & =-u t+ 1 2 g t^2 & =-29 10+ 1 2 9.8 (10)^2 & =-290+490 & =200 ~m aligned

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