An aircraft flying at 40,000 feet can be heard to break the sound barrier when it achieves a speed of how many miles per hour?
600 The speed of sound at sea level is 760 m.p.h, and it decreases with altitude.
In July, a transport aircraft of the Indian Air Force with 29 people on board disappeared while flying over the Bay of Bengal. The fate of the aircraft is yet to be known. Identify the aircraft make?
