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What is the escape velocity of a satellite launched from the earth’s surface? (Take g...

Physics
NECO 2002

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
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Correct Answer: Option B
Explanation

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


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