Great Ramones, Thanks for your repsonse. It helped me. Now when I set to negative value then wheel is reducing its speed which is great and then started moving back.
I am trying for the event when wheel speed is <=0 to set the wheel rotate speed= 0 and acceleration =0 but no luck.
Could you please help me on which event I can set speed=0 and acceleration =0 for the wheel so that wheel will stop slowly?