# Sandbox.PhysicsGroup.AddVelocity

```csharp
void AddVelocity(Vector3 vel)
```

Adds given amount of velocity ([Sandbox.PhysicsBody.ApplyForce](/api/Sandbox.PhysicsBody/ApplyForce)) to all physics bodies in this group.

### Parameters

- `vel` (`Vector3`): How much linear force to add?

Declared in [Sandbox.PhysicsGroup](/api/Sandbox.PhysicsGroup).
Assembly: `Sandbox.Engine`.