25.3kms-1
4.2kms-1
4.0kms-1
11.3kms-1
Correct answer is D
Vescape = √2gR
Vescape = √2×10×6.4×106
Vescape = √128000000
Vescape = 11313.7085mS-1
Vescape = 11.313kmS-1
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