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## Homework Statement

When an F-18 jet lands on the runway, it's position is defined by s(t)=189t-t^7/3 meters after t seconds

calculate the braking time

calculate the deceleration when the jet stops ( i think she means immediately before?)

## Homework Equations

derivative

## The Attempt at a Solution

s'(t)=189-7/3t^4/3