What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms\(^{-2}\) and the radius of the earth as 6.4 × 10\(^6\)m)
A
7.80 × 10kms-1
B
11.2 × 10kms-1
C
3.56 × 107ms-1
D
6.00 × 107ms-1
E
1.20 × 108ms-1
Verified Correct Answer: B.
Physical Principles & Numerical Solution
V\(_e\) = \(\sqrt{2gr}\)
V\(_e\) = \(\sqrt{2 \times 10 \times 6.4 \times 10^6}\) = 11.313km/s
The escape speed from Earth's surface is about 11.186 km/s
Source: WAEC / JAMB / NECO Classroom Archive (Record #42866)