ఒక బంతి 10 మీటర్ల ఎత్తు నుండి పడవేయబడుతుంది. ఇది భూమిని తాకి 2.5 మీటర్ల ఎత్తు వరకు మళ్ళీ పైకి ఎగిరింది. ఘర్షణ సమయంలో, గతి శక్తిలో నష్ట శాతం:

This question was previously asked in
RRB ALP Previous Paper 6 (Held On: 13 Aug 2018 Shift 1)
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  1. 100%
  2. 25%
  3. 50%
  4. 75%

Answer (Detailed Solution Below)

Option 4 : 75%
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  • స్వేచ్చా పతనం పరిస్థితిలో, సంభావ్య శక్తి గతి శక్తిగా (K.E) మార్చబడుతుంది
  • యాంత్రిక శక్తి పరిరక్షణ నియమం ప్రకారం:
  • ప్రారంభ గతి శక్తి = mgh
  • చివరి గతి శక్తి = mgh1
  • గతి శక్తిలో మార్పు = mg (h-h1)
  • గతి శక్తిలో శాతం మార్పు = \(\frac{{{\rm{mg}}\left( {{\rm{h}} - {\rm{\;h}}1} \right)}}{{{\rm{mgh}}}}\) × 100 = [(7.5/10) × (100)] = 75%.
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