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Motion in A Straight Line question

2011 · Q145
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Motion in A Straight Line question

2011 · Q145

NEETPhysicsMotion in A Straight LineMCQ+4 / −1
A boy standing at the top of a tower of 20 m height drops a stone. Assuming g = 10 m s−-−2, the velocity with which it hits the ground is
  1. A
    10.0 m/s
  2. B
    20.0 m/s
  3. C
    40.0 m/s
  4. D
    5.0 m/s
View written solutionFree

Correct answer: B

We know, v2 = u2 + 2gh

Here u = 0

∴\therefore∴ v = 2gh\sqrt {2gh} 2gh​ = 2×10×20\sqrt {2 \times 10 \times 20} 2×10×20​ = 20 m/s

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