37.8 m/s37.8 \mathrm{~m} / \mathrm{s}37.8 m/s
67.8 m/s67.8 \mathrm{~m} / \mathrm{s}67.8 m/s
38.7 m/s38.7 \mathrm{~m} / \mathrm{s}38.7 m/s
None of these \text { None of these } None of these