The tension in the spring is ............ $N$
The tension in the spring is ............ $N$
$0$
$2.5$
$5$
$10$
The tension in the spring is ............ $N$
$5\,N$ force will not produce any tension in spring without support of other $5\,N$ force. So here the tension in the spring will be $5\,N$ only.