Question : open a window using javascript

I have a need to alert through php,
I have the code below. Problem is that it works as long as I dont use header redirect. But as soon as I use it..I loose alert.

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<?php

echo "I will do some functions here in php";
if($value == 1){
alert('ok working');
}
header(location: 'someOtherpagethanthis.php');
?>

?>

Answer : open a window using javascript

>> the total momentum of the hammer is transfered to the pile of mass, provided that the hammer does NOT BOUNCE.

Terminology or ?

Assuming no bounce, I wouldn't say that this is transferring the entire momentum to the pile of mass, since both the hammer and the pile of mass are now both moving with the same speed.