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NEET 2009
Exam
NEET
Year
2009
Subject
Physics
Chapter
Work, Power and Energy

NEET 2009 · Physics · Work, Power and Energy

A body of mass 1 ~kg of thrown upwards with a velocity 20 ~m / s ....

A body of mass 1 kg1 \mathrm{~kg} of thrown upwards with a velocity 20 m/s20 \mathrm{~m} / \mathrm{s}. It momenetarily comes to rest after attaining a height of 18 m18 \mathrm{~m}. How much energy is lost due to air friction ? \left(\mathrm{g}=10  m\mathrm{~m}/ \mathrm{s}^2\right)

Options

  1. A10 J10 \mathrm{~J}
  2. B20 J20 \mathrm{~J}
  3. C30 J30 \mathrm{~J}
  4. D40 J40 \mathrm{~J}

Correct answer

B. 20 J20 \mathrm{~J}

Step-by-step solution

Loss of energy =12mv2−mgh=20 J=\frac{1}{2} \mathrm{mv}^2-\mathrm{mgh}=20 \mathrm{~J}
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