QUESTION: 
What if the parachute does not open for the landing of the Pathfinder?

ANSWER from Tommaso P Rivellini on December 10, 1996:
If the parachute does not open the lander will not slow down enough 
for the rockets or the airbag to work properly. The result would most 
likely be that the lander crashes into the ground at about 200-300 mph.