The critical feature is that partner has bid 2 freely. With a minimum opener and five Spades a good player never rebids 2 in these positions (and my partner is certainly a good player). I can take it that partner has either a good suit or a good hand (and possibly both!) so Pass is out of the question. Even though North's Spades will be good it does not mean the hand will play well in his suit. A Diamond lead is sure to come whistling through the A Q and that would be a poor start. My view is that this is a hand where we might snatch 3NT on minimum values so, to take the pressure off him I jump to 3NT.