1. The problem statement, all variables and given/known data Your airplane is caught in a brief, violent downdraft. To your amazement, the pretzels on your seatback tray rise vertivally, and you estimate their upward acceleration relative to the plane at 2 m/s^2. What's the donward acceleration of the plane? ANy suggestions are highly aprreciated!!!! 2. Relevant equations 3. The attempt at a solution what I know is that if the plane is in such a situation it's subject to the gravitational force only, but why we're given this pretzels acceleration?