एक बच्चा झूले पर झूल रहा है। उसकी जमीन से निम्नतम व अधिकतम ऊँचाई क्रमशः 0.75 मीटर व 2 मीटर है। उसकी अधिकतम चाल होगी -

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  1. 10 मी./से. 
  2. 5 मी./से. 
  3. 8 मी./से. 
  4. 15 मी./से.

Answer (Detailed Solution Below)

Option 2 : 5 मी./से. 
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Detailed Solution

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प्रयुक्त सूत्र:

अधिकतम चाल (v) = \(\sqrt{2g(H_2-H_1)}\)

यहाँ g गुरुत्वाकर्षण के कारण त्वरण है

H2 अधिकतम ऊंचाई है

H1 न्यूनतम ऊंचाई है

अनुप्रयोग:

दिया है,

g = 10 (मान लीजिए)

H2 - H1 = 2 - 0.75 = 1.25 m

उपरोक्त सूत्र का उपयोग करके:

v = \(\sqrt{2\times 10 \times 1.25}= \sqrt{25}=5\ m/s\)

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