var myTween = new TweenLite.to('.box', 2, {width:100, height:100, ease:Back.easeInOut.config(10), y:10, x:10, paused:true});
$('.btn_start').on('click',function(){
myTween.resume();
})
<button class="btn_start" type="button">Start!</button> <br><br> <div class="box"></div>
.box{width:50px;height:50px;background-color:#000}
.btn_start{background-color:#c0b8ff}