Merge pull request #1994 from INEEDSSD/LayaAir_3.2

fix: Fixed rigidbody linear velocity method resetting value issue.

Author: LayaCharley

src/layaAir/laya/physics/RigidBody.ts

@@ -573,6 +573,7 @@ export class RigidBody extends Component {
      */
     setVelocity(velocity: IV2): void {
         if (!this._body) this._onAwake();
+        this._linearVelocity = velocity;
         Physics2D.I._factory.set_rigidBody_linearVelocity(this._body, velocity);
     }