0
9.8 m/s29.8 \mathrm{~m} / \mathrm{s}^{2}9.8 m/s2
−9.8 m/s2-9.8 \mathrm{~m} / \mathrm{s}^{2}−9.8 m/s2
4.9 ms24.9 \mathrm{~ms}^{2}4.9 ms2