{% extends arithmetic_template %}

{% block maincell %}
<script type="text/javascript" src="/javascript/kinematics.js?{{App.version}}"></script>
<script language=Javascript1.2><!--

/***
Kinematics equations
Provides the student with 3 of 5 kinematics variables and asks to solve for an unknown.
***/

// unknown is an unknown
// solving is the unknown we're actually solving for in this problem
var unknown, solving, motion;

rollUnknowns();

var rint = getRandomInt(5);
if (rint == 0) {
	// 1/6 chance of constant velocity problem
	motion = randomConstantMotion();
	
	// if you don't have d and/or t for a constant velocity problem,
	// you are screwed
	while ( (unknown == "d" && solving == "t") ||
			(unknown == "t" && solving == "d") ) {
		rollUnknowns();
	}
} else if (rint > 3) {
	// 2/6 chance of freefall problem
	motion = randomFreefallMotion();
} else {
	// 3/6 chance of random-accel problem
	motion = randomAccelMotion();
}

write_text("<p>Solve for `" + solving + "` to the nearest tenth.</p><p>Make sure you select the proper units. You may do arithmetic with a calculator.</p>");
printMotion(motion, [unknown, solving]);

hintWithNo[unknown](motion, solving);
//-->
</script>

{% endblock maincell %}

{% block answerarea %}
<span class="info-box-header">Answer</span>
<input type="text" size=10 id="answer"  autocomplete="off" name="answer" onkeypress="if (event.keyCode == 13) {check_answer_block(); return false;}">
<select id="answerunit">
  <option value=""></option>
  <option value="m">m</option>
  <option value="s">s</option>
  <option value="m/s">m/s</option>
  <option value="m/(s^2)">m/s^2</option>
</select></br>
{% endblock answerarea %}

{% block checkanswer %}
// Answer checking is slightly more lenient here.
// We allow +-1.0 error...
highlight_answer();

var usersAnswerUnit = document.getElementById("answerunit").value;

var result = isInputCorrect($("#answer").val(), motion[solving], 1.0)

if (result != Answer.INVALID) {
  handleCorrectness(result == Answer.CORRECT && usersAnswerUnit == kunits[solving]);  
}

{% endblock checkanswer %}

{% block hintfunction %}give_next_step(){% endblock hintfunction %}