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v = u + at

v = 173 mph

u = 0 mph (assuming taking off from rest)

t = 35.2 s

Thus: 173 = 0 + 35.2a

a = 173/35.2

a = 4.917777... mph/s

(To convert to m.s-2 multiply by 0.44704 => 2.198 m.s-2)

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Q: A 747 airliner reaches its takeoff speed of 173 mih in 35.2 s. What is is the magnitude of its average acceleration?
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