3×108 m/s3 \times 10^{8} \mathrm{~m} / \mathrm{s}3×108 m/s
2.25×108 m/s2.25 \times 10^{8} \mathrm{~m} / \mathrm{s}2.25×108 m/s
2.25 m/s2.25 \ m/s2.25 m/s
4.4×10−7 m/s4.4 \times 10^{-7} \mathrm{~m} / \mathrm{s}4.4×10−7 m/s
