boring river quiz

[Wayfare]

1) I never get to the river with a $50 pot with the nut boat. If my arm somehow falls off and I can't bet but I stich it on in time for the river, I bet $100 here.
2) I bet $50, call raise
3) I c/c
4) I bet $40 FTR
5) Bet $50, raise all in if raised
6) c/f
7) c/f

[soah]

Wayfare, you would bet a pair of jacks but check/call a pair of kings? Can you explain your reasoning?