Question Speed of an object

I am stuck trying to figure out how to maintain the constant speed of an object in Unity. When the object bounces back and forth from other objects it gets faster and faster, and I want to learn how to make sure it stays at a constant speed.

 

How do you set the speed?

rigidbody.velocity = transform.forward * 10;

inside the Update or FixedUpdate Method results in constant speed. Whenever the speed changes, it is set back to the fixed value, every frame.

 

Code (CSharp):

1. GetComponent<Rigidbody>().drag=1.0f;

 

Thank you I will try these