A rocket leaves Earth’s surface with a speed of

MATHEMATICS · Single correct · AoPS · Mathematics · Ratios and Percents · Ratios and Percents

Problem

9.0\,\text{km/s}

. If Earth’s escape velocity is

11.2\,\text{km/s}

, approximately what percentage of the escape velocity has the rocket achieved? (a) 72\% (b) 92\% (c) 80\% (d) 64\%