An aero plane is said to have crossed the sound barrier if it travels at or beyond a certain speed W...........

General Science (Easy) Physics

An aero plane is said to have crossed the sound barrier if it travels at or beyond a certain speed. What is this speed per hour ?

750 miles

345.7 miles

1440 miles

475.5 miles

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Explanation:

750 miles

-upersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 343.2 m/s (1,126 ft/s; 768 mph; 667.1 kn; 1,236 km/h).