JAMB Physics 2014 Objective — Question 8

Question 8 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.

Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4×10⁶m. [g=10ms⁻²]

A. 4.2 kms⁻¹
B. 4.0 kms⁻¹
C. 11.3 kms⁻¹Correct
D. 25.3 kms⁻¹

Explanation

Escape velocity = √(2gR) = √(2×10×6.4×10⁶) = √(1.28×10⁸) = 11313.7m/s ≈ 11.3 km/s.

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