A) 58.8 m/s
B) 49 m/s
C) 65 m/s
D) 19.6 m/s
Correct Answer: C
Solution :
\[{{h}_{{{n}^{th}}}}=u-\frac{g}{2}(2n-1)\] \[{{h}_{{{5}^{th}}}}=u-\frac{10}{2}(2\times 5-1)=u-45\] \[{{h}_{{{6}^{th}}}}=u-\frac{10}{2}(2\times 6-1)=u-55\] Given \[{{h}_{{{5}^{th}}}}=2\times {{h}_{{{6}^{th}}}}\].By solving we get \[u=65\ m/s\]
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