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2 मीटर लम्बी डोरी से बंधे पत्र को उर्धव व्रत में घूम,आया है । व्रत के निम्नतम बिंदु पर आवशयक न्यूनतम चा, जिससे की पत्थर व्रत को पूरा क्र ले होगी ( g = 9.8 मीटर/सेकण्ड`""^2`) :
A. `sqrt(19.6)`मीटर/सेकण्ड
B. `2sqrt(8.8)`मीटर/सेकण्ड
C. `7sqrt(2)`मीटर/सेकण्ड
D. 7 मीटर/सेकण्ड

1 Answer

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Correct Answer - C
न्यून्तम चाल `v=sqrt("5 g l")=sqrt((5xx9.8"मीटर/सेकण्ड"^2xx2"मीटर"))`
`=sqrt(98"मीटर"^2//"सेकण्ड"^2)=7sqrt2"मीटर/सेकण्ड"`|

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