1.5 m/sec21.5 \mathrm{~m} / \mathrm{sec}^{2}1.5 m/sec2
2 m/sec22 \mathrm{~m} / \mathrm{sec}^{2}2 m/sec2
2.4 m/sec22.4 \mathrm{~m} / \mathrm{sec}^{2}2.4 m/sec2
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