A) 80 km
B) 16 km
C) 40 km
D) 64 km
Correct Answer: A
Solution :
\[r=R+h\cong R\] \[x=\sqrt{{{(R+h)}^{2}}-{{R}^{2}}}\] \[=\sqrt{{{h}^{2}}+2hR}\] \[{{x}^{2}}=25000+2.500\,\,\,6.4\,\,100000\] \[=25000+\,\,(64\times \,\,100000000)\] \[={{10}^{4}}(640025)\] \[{{x}^{2}}\cong {{10}^{4}}.640000\] \[x=8\times {{10}^{4}}m\] \[=80\] km.You need to login to perform this action.
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