Write a question about the following article: Hoping to rebound from a divisional home loss to the Eagles, the Cowboys flew to Bank of America Stadium for a Week 16 Saturday night duel with the Carolina Panthers.  In the first quarter, Dallas shot first with QB Tony Romo completing a 10-yard TD pass to WR Terrell Owens for the only score of the period.  In the second quarter, the 'Boys continued their assault as RB Marion Barber got a 5-yard TD run.  The Panthers would get on the board with QB Matt Moore completing an 11-yard TD pass to WR Steve Smith.  The Cowboys end the half with rookie kicker Nick Folk getting a 42-yard field goal. In the third quarter, Carolina started to try a comeback as kicker John Kasay getting a 37-yard field goal for the only score of the period.  In the fourth quarter, Dallas would respond with Folk kicking a 23-yard field goal.  The Panthers tried to rally as Kasay nailing a 25-yard field goal, yet the 'Boys were able to hold off every possible attempt. With the win, the Cowboys improved to 13-2 and clinched homefield  through NFC Playoffs with Green Bay's loss to Chicago on Sunday. Terrell Owens (5 receptions for 48 yards and 1 touchdown) left the game in the second quarter with a high left ankle sprain.

Question about the article:
How many yards was the longest field goal of the second half?