Question

which of the following best describes the mission of the x-1 aircraft?
a. to fly at the speed of light
b. to put a man on the moon
c. to put an aircraft into outer space
d. to fly faster than the speed of sound

Explanation:

The X - 1 aircraft was designed to break the sound barrier, which means flying faster than the speed of sound. Flying at the speed of light (A) is currently impossible for aircraft. Putting a man on the moon (B) was the mission of the Apollo program. Putting an aircraft into outer space (C) is not the main mission of the X - 1.

Answer:

D. To fly faster than the speed of sound