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A body freely falling from the rest has velocity `v` after it falls through a height `h` the distance it has to fall down for its velocity to become double isA. 8 hB. 6 hC. 4 hD. 5 h |
Answer» Correct Answer - C `upsilon=sqrt(2gh)` or `upsilon prop sqrt(h)` `rArr (upsilon_(1))/(upsilon_(2))=sqrt((h_(1))/(h_(2)))rArr ((upsilon_(1))/(upsilon_(2)))^(2)=(h)/(h_(2)) " " {because h_(1)=h}` `rArr ((upsilon)/(2upsilon))^(2)=(h)/(h_(2)) " " {{:(because upsilon_(1)=upsilon),(therefore upsilon_(2)=2upsilon):}}` `rArr h_(2)=4h` |
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