20 m/sec20 \mathrm{~m} / \mathrm{sec}20 m/sec
22 m/sec22 \mathrm{~m} / \mathrm{sec}22 m/sec
25.4 m/sec25.4 \mathrm{~m} / \mathrm{sec}25.4 m/sec
29.4 m/sec29.4 \mathrm{~m} / \mathrm{sec}29.4 m/sec