1. The problem statement, all variables and given/known data A 350 kg piano is dropped from a stationary helicopter. As it falls, it picks up speed and the air resistance increases, causing its acceleration to be less than 9.8 m/s2 What is the piano's acceleration at the moment that the air resistance is exerting an upward force of 1400 N? 2. Relevant equations w=mg 3. The attempt at a solution a=w-fair /m w=mg w= 350 kg*9.8 m/s2 w=3430 N a=3400-1400 N / 350 kg a=2030/350 kg =5.8 m/s2 This is less than the force of gravity, ans seems reasonable. Could someone confirm? Thanks!