30 m/sec30 \mathrm{~m} / \mathrm{sec}30 m/sec
40 m/sec40 \mathrm{~m} / \mathrm{sec}40 m/sec
90 m/sec90 \mathrm{~m} / \mathrm{sec}90 m/sec
50 m/sec50 \mathrm{~m} / \mathrm{sec}50 m/sec