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CBSE Class 11-science Answered

clear my doubt
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Asked by subhashreeojha235 | 20 Jul, 2023, 11:22: AM
answered-by-expert Expert Answer
Part (i)
 
Average speed between t =2 s and t = 6 s is
 
begin mathsize 14px style top enclose v space equals space fraction numerator d i s tan c e space t r a v e l l e d over denominator t i m e end fraction space end style
begin mathsize 14px style top enclose v space equals space πr subscript 1 over 4 space equals space fraction numerator straight pi space cross times 10 over denominator 4 end fraction space m divided by s space equals space 2.5 space straight pi space straight m divided by straight s end style
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Part (ii)
 
Average speed between t = 2 s to t = 10 s is
 
begin mathsize 14px style top enclose v space equals space fraction numerator d i s tan c e space t r a v e l l e d over denominator t i m e end fraction space equals space fraction numerator πr subscript 1 space end subscript plus space straight pi space straight r subscript 2 over denominator 8 end fraction space end style
begin mathsize 14px style top enclose v space equals space space space fraction numerator straight pi space cross times 10 space plus space straight pi space cross times 10 over denominator 8 end fraction space m divided by s space equals space 2.5 space straight pi space straight m divided by straight s end style
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Part (iii)
 
Average velocity between t=2 s to t = 12 s is
 
begin mathsize 14px style v with rightwards arrow on top subscript a v g end subscript space equals space fraction numerator d i s p l a c e m e n t space over denominator t i m e end fraction space equals space fraction numerator 50 space m over denominator 10 space s end fraction space equals space 5 space m divided by s end style
Answered by Thiyagarajan K | 20 Jul, 2023, 09:37: PM

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