// TAP 220- 3: Inelastic collisions

var ifrm = document.getElementById('ext_iframe_2_1');
var win = ifrm.contentWindow;
var doc = ifrm.contentDocument ? ifrm.contentDocument : ifrm.contentWindow.document;
var powMinusOne = '\u02C9\u00B9';

function round(unRoundedValue){
    return Math.round(unRoundedValue*1000)/1000;
}

var q0multiple = +doc.getElementById('x1').innerHTML;
var q0answer = (q0multiple + 0.5) / (q0multiple + 1);
doc.getElementById('Q_0_Guess').value = round(q0answer) + 'ms' + powMinusOne;
win.CheckShortAnswer(0);

win.CheckMCAnswer(1,2,doc.getElementById('Q_1_2_Btn'));

var q2mass = +doc.getElementById('x3').innerHTML;
var q2velocity = +doc.getElementById('x4').innerHTML;
var q2answer = 7000 - ( ( (400*7000)-(q2mass*q2velocity*1000) ) / (400+q2mass) );
doc.getElementById('Q_2_Guess').value = round(q2answer) + 'ms' + powMinusOne;
win.CheckShortAnswer(2);

var q3mass = +doc.getElementById('x5').innerHTML;
var q3answer = (q3mass * 0.2) / (q3mass + 6.6);
doc.getElementById('Q_3_Guess').value = round(q3answer) + 'ms' + powMinusOne;
win.CheckShortAnswer(3);