public void addDecayAcceleration(float acceleration){
  this.decayAccelerationLevel=Math.min(this.decayAccelerationLevel + acceleration,40.0F);
}

public void addDecayAcceleration ( float acceleration ) { this . decayAccelerationLevel = Math . min ( this . decayAccelerationLevel + acceleration , 40.0F ) ; }
adds decay acceleration ( once > = 4 is accumulated the decay level is increased by one )
