$answer){ //Check the answer hasn't already been submitted. $testQuery=mysql_query("select count(id) as c from ".$mysqlAnswerTable." where sn=".$_SESSION['sn']." and question=".$question); if(mysql_error()){ echo "Please report this to the administrator: ".mysql_error(); die; } if(mysql_result($testQuery,0,'c')!=0) {mysql_close(); header("location:".$nextQuestionURL); die(); }; $query="insert into ".$mysqlAnswerTable."(sn,course,question,answer,tstamp) values('".mysql_escape_string($_SESSION['sn'])."','".mysql_escape_string($_SESSION['course'])."',".$question.",'".mysql_escape_string($answer)."',".time().")"; mysql_query($query); if(mysql_error()){ echo "Please report this to the administrator: ".mysql_error(); die; } } //Go to the next question. mysql_close(); header("location:".$nextQuestionURL); die(); } else if(isset($_POST['Submit'])) $flag=1; ?> Question 9
Question 9




Below is shown a position-time graph, and velocity-time graph. Could these graphs represent the same motion or not? Give reasons for your answer.







Write your answer in the box below.