Trunk pop open when driving - Jetta Volkswagen Cars & Trucks

Close hood and lift up on hood to see if it stays closed.
if not, check inside car to see if latch(that you pull) is in the correct position. you can tell when hood is closed that there will be some tension on latch.
check under hood, where hood closes on latch of hood, is tight and secure(no loose bolts)
also check cable if broken.
only those things can cause hood to pop open.
if all visual inspections check out and still continues to open while driving then the latch (the mechanism that hold the hood down) is bad. vibrating while driving will cause it to open.