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A body dropped from height H reaches the ground with a speed of 
- a)mgh
- b)-0.28mgH
- c)2gh
- d)0.5gh
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A body dropped from height H reaches the ground with a speed ofa)mghb)...
The forces acting on the body are the force of gravity and the air friction. By work energy theorem, the total work done on the body is
W=1/2m(1.2√gH)2−0=0.72mgH
The work done by the force of gravity is mgH.
. Hence, the work done by the air friction is,
=0.72mgH-mgH
=00.28mgH.
W=1/2m(1.2√gH)2−0=0.72mgH
The work done by the force of gravity is mgH.
. Hence, the work done by the air friction is,
=0.72mgH-mgH
=00.28mgH.
Most Upvoted Answer
A body dropped from height H reaches the ground with a speed ofa)mghb)...
POTENTIAL ENERGY - WORK DONE BY AIR FRICTION =KINETIC ENERGY
Work done= P.E.- K.E.
= mgH - (mv^2)/2
= mgH(1-0.72)
= 0.28 mgH
Work done= P.E.- K.E.
= mgH - (mv^2)/2
= mgH(1-0.72)
= 0.28 mgH
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A body dropped from height H reaches the ground with a speed ofa)mghb)-0.28mgHc)2ghd)0.5ghCorrect answer is option 'B'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about A body dropped from height H reaches the ground with a speed ofa)mghb)-0.28mgHc)2ghd)0.5ghCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A body dropped from height H reaches the ground with a speed ofa)mghb)-0.28mgHc)2ghd)0.5ghCorrect answer is option 'B'. Can you explain this answer?.
A body dropped from height H reaches the ground with a speed ofa)mghb)-0.28mgHc)2ghd)0.5ghCorrect answer is option 'B'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about A body dropped from height H reaches the ground with a speed ofa)mghb)-0.28mgHc)2ghd)0.5ghCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A body dropped from height H reaches the ground with a speed ofa)mghb)-0.28mgHc)2ghd)0.5ghCorrect answer is option 'B'. Can you explain this answer?.
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