code: function (x, y) {
              this.accel.x = x !== 0 ? x : this.accel.x;
              this.accel.y = y !== 0 ? y : this.accel.y;
  
              // limit by default to the same max value
              this.setMaxVelocity(x, y);
          }
docs: Sets accel to Velocity if x or y is not 0.  Net effect is to set the maxVel.x/y to the passed values for x/y<br>
  note: This does not set the vel member of the body object. This is identical to the setMaxVelocity call except that the
  accel property is updated to match the passed x and y.
  setMaxVelocity if needed<br>
  @name setVelocity
  @memberOf me.Body
  @function
  @param {Number} x velocity on x axis
  @param {Number} y velocity on y axis
  @protected
  @deprecated
  @see me.Body.force