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Work Energy and Power question

2001 · Q156
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Work Energy and Power question

2001 · Q156

NEETPhysicsWork Energy and PowerMCQ+4 / −1
A child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respectively, its maximum speed will be
  1. A
    10 m/s
  2. B
    5 m/s
  3. C
    8 m/s
  4. D
    15 m/s
View written solutionFree

Correct answer: B

Drop in P.E. = maximum K.E.

mg(2 – 0.75) = 1mv2

⇒\Rightarrow⇒ v = 2g(1.25)=5 m/s\sqrt {2g\left( {1.25} \right)} = 5\,m/s2g(1.25)​=5m/s

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