A 1 Kg object is dropped from rest from a helicopter at an altitude of 2000 meters. What is the velocity of the object just before it lands upon a thick bed of pillows? The top of the pillow stack is at zero altitude. If the restoring force constant (spring constant) of the stack of pillows is 1 N/m, how far into the stack will the object travel before it comes to a full stop? Neglect air resistance.