Shock Waves: a Jet Aircraft, in Level Flight at Constant

Multiple Choice

Shock waves: A jet aircraft, in level flight at constant speed, is observed directly overhead. A sonic boom is heard later, at which time the line of sight to the aircraft forms a 51° angle with respect to the horizontal. The speed of sound is 325 m/s. The altitude of the aircraft is closest to

A) 6700 m.
B) 5400 m.
C) 8300 m.
D) 2700 m.
E) 13,000 m.