Practice question

MCQ

Question

What is the escape speed from a planet with mass 9×1023kg and radius 2.5×106m? (G\=6.67×10−11N m2/kg2)

Options

Choose one · Correct answer highlighted

6.7 km/s 6.8 km/s 6.9 km/s Correct 7.0 km/s

Explanation

ve = 2GMR. ve = 2×6.67×10−11×9×10232.5×106. ve = 4.801×107≈6.93×103m/s≈6.9km/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 6.9 km/s. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.

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