# Changing speed of an object

Is there a way of changing speed of an object at certain time? I want to change my speed to my initial speed after colliding with any object. I have already added bounce Physics to my colliding objects and player object with Friction set to 0. Please help.

Get the Rigidbody component. Then change the velocity value.

Rigidbody rb;

void Start()
{
rb = GetComponent<Rigidbody>();
}

void ChangeSpeed()
{
rb.velocity = new vector3(x,y,z); //place your value in xyz
}


For further reference: Unity Physics Rigidbody Velocity

You could apply a force opposite to it for decceleration or a force in the movement direction for acceleration.

## Example:

for acceleration:

GetComponent<Rigidbody>().AddForce(transform.forward * FORCE_CONSTANT);


or for desceleration:

GetComponent<Rigidbody>().AddForce(-transform.forward * FORCE_CONSTANT);