An aircraft travelling at 600km/hr accelerate steadily at 10km/hr per second. Taking the speed of sound as 1100km/hr at the aircraft's altitude, how long will it take to reach the sound's barrier?
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Answer:
V = U + at
1100 = 600 + 10 × t
1100 - 600 = 10t
10t = 500
t = 500 / 10
t = 50 second
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