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In 1986, the first flight around the globe without a single refueling was completed. The aircraft’s average speed was 186 km/h. If the airplane landed at this speed and accelerated at −1.5 m/s2 , how long did it take for the airplane to stop?

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Answer: 34.4 sec

Explanation: Assuming that the desacceleration was constant, we have  a = -1.5m/s²

vi = 186 km/h → 51.6 m/s

vf = 0 (because it stopped)

Vf = Vi + at

0 = 51.6 - 1.5t

1.5t = 51.6

t = 34.4 s

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