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## Homework Statement

An airplane touches down at a speed of 100m/s. It travels 1000 metres along the runway

while deceleration at a constant rate before coming to rest. How long did it take the airplane to come to rest on the runway?

Xi=0m/s Xf=1000m Vix=100m/s

## Homework Equations

Xf=Xi+Vixt

## The Attempt at a Solution

1000=0+100t

t=10s

Why is the answer 20 s? and why does this formula fail?

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