this.velocity = new Vector(0, 0);
}
public final void applyImpulse(final Vector impulse) {
Vector deltaVelocity = new Vector(impulse);
deltaVelocity.divide(mass);
velocity.add(deltaVelocity);
}
public final void addVelocity(final Vector deltaVelocity) {
velocity.add(deltaVelocity);