AnswerWithUnits1

Answer is a Number or Formula with Units

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This PG code shows how to require students to enter units with their answers.

• File location in OPL: FortLewis/Authoring/Templates/DiffCalc/AnswerWithUnits.pg

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PG problem file	Explanation
Problem tagging data	Problem tagging:
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "parserNumberWithUnits.pl", "parserFormulaWithUnits.pl", ); TEXT(beginproblem());	Initialization: We load parserNumberWithUnits.pl and parserFormulaWithUnits.pl.
Context("Numeric")->variables->are(t=>"Real"); $h = Formula("-16 t^2 + 16"); $v = $h->D('t'); $v1 = $v->eval(t=>1); $a = $v->D('t'); $answer[0] = FormulaWithUnits("$v","ft/s"); $answer[1] = NumberWithUnits("$v1","ft/s"); $answer[2] = FormulaWithUnits("$a","ft/s^2");	Setup: We use the differentiation operator ->D('t') and the evaluation method ->eval() to construct the derivative and evaluate it as a function. If we were writing several questions like this with different height functions, using the differentiation and evaluation methods would really speed up the writing.
Context()->texStrings; BEGIN_TEXT Suppose the height of a falling object, in feet above the ground, is given by \( h(t) = $h \) for \( t \geq 0 \), where time is measured in seconds. $BR $BR (a) What is the velocity of the object? Include units in your answer. $BR \{ ans_rule(20) \} \{ helpLink("units") \} $BR $BR (b) What is the velocity of the object when it hits the ground? Include units in your answer. $BR \{ ans_rule(20) \} \{ helpLink("units") \} $BR $BR (c) What is the acceleration of the object? Include units in your answer. $BR \{ ans_rule(20) \} \{ helpLink("units") \} END_TEXT Context()->normalStrings;	Main Text: Don't forget to use helpLink("units") so your students will have access to the complete list of units that WeBWorK understands.
$showPartialCorrectAnswers = 1; foreach my $i (0..2) { ANS( $answer[$i]->cmp() ); }	Answer Evaluation:
Context()->texStrings; BEGIN_SOLUTION Solution explanation goes here. END_SOLUTION Context()->normalStrings; COMMENT('MathObject version.'); ENDDOCUMENT();	Solution:

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