I want to say :
After get speed x 3 then the ball speed be a slower and slower
For slower and slower, you need a Friction Clock.
Pull an extra Clock into the Designer from the Sensors Drawer, and rename it FrictionClock to help distinguish it from any other Clocks.
In the Blocks Editor, pull in a Timer event block for FrictionClock, and in it,
set Ball1.Speed to Ball1.Speed * 0.8
This will gradually reduce the speed of Ball1.
Multiplying by a number between 0 and 1 reduces a number.
Multipl;ying by a number bigger than 1 increases the number.
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Thanks 