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Earlier discussion
1 older comment kept for context.
AbdulAzeez Oluwasina
V=√2gr
Where v is escape velocity
Convert the radius of the earth to meter
I.e 6.4×10³km to meter
= 6.4×10³×1000m
g=10ms-²
V=√2×10×6.4×10³×1000
V=√128000000
V=11313.7085ms-¹
V=11.313kms-¹