Subject: What would happen to relativistic mass if slowed down?

Suppose you had a 1 kg object and managed to accelerate it to the point where 
it gained 100 kg in relativistic mass. At this point, a braking force is 
applied until the object is stopped relative to the observer. Assuming both the 
acceleration and braking process didn't require onboard fuel (let's assume 
that all energy consumption was from outside sources that drove the 
acceleration/deacceleration) would the object at rest have a mass of 1 kg or 
100 kg when brought back to rest? If 1 kg, what happened to the relativistic 
mass? 

Re: What would happen to relativistic mass if slowed down?