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Work Energy and Power question

2004 · Q144
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Work Energy and Power question

2004 · Q144

NEETPhysicsWork Energy and PowerMCQ+4 / −1
A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet ball building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of
  1. A
    2\sqrt 22​ : 1
  2. B
    1 : 4
  3. C
    1 : 2
  4. D
    1 : 2\sqrt 22​
View written solutionFree

Correct answer: C

From the question, as height is same for both balls, so their velocities on reaching the ground will be same.

Hence in such case kinetic energy ∝ mass

So, K.E1K.E2=m1m2=12{{K.{E_1}} \over {K.{E_2}}} = {{{m_1}} \over {{m_2}}} = {1 \over 2}K.E2​K.E1​​=m2​m1​​=21​

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