Most important in an investigation of an airplane crash by the U.S. National Tra

Question

Most important in an investigation of an airplane crash by the U.S. National Transportation Safety Board is the data stored on the airplane’s flight-data recorder, commonly called the “black box” in spite of its orange coloring and reflective tape.The recorder is engineered to withstand a crash with an average deceleration of magnitude 3410 g during a time interval of 6.34 ms. In such a crash, if the recorder and airplane have zero speed at the end of that time interval, what is their speed at the beginning of the interval?

Explanation / Answer

a = acceleration = - 3410 x 9.8 = - 3341.8m /s2

Vf = final velocity = 0 m/s

Vi = initial velocity = ?

t = time = 0.00634 sec

using the equation

Vf = Vi + at

0 = Vi + (- 3341.8) (0.00634)

Vi = 21.2 m/s

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