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Question

What is the escape speed from a planet with mass 2.4×1024kg and radius 4×106m? (G\=6.67×10−11N m2/kg2)

Options

Choose one · Correct answer highlighted

Explanation

ve = 2GMR. ve = 2×6.67×10−11×2.4×10244×106. ve = 8.002×107≈8.95×103m/s≈8.95km/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 8.9 km/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.