If the radius of the earth is 6.4 x 106m; the escape velocity of a satellite from the earth is? [g = 10 ms−²]

A. 1.13 x 10⁴ ms^-1
B. 9.00 x 10³ ms^-1
C. 8.00 x 10³ ms^-1
D. 1.27 x 10⁴ ms^-1

Correct Answer:

Option A = 1.13 x 10⁴ ms^-1

Explanation

Vesc = √2Rg. =√2 x 6.4 x 10⁶ x 10 = 1.13 x 10⁴ ms^-1