The average speed of a nitrogen molecule

The average speed of a nitrogen molecule in air is about 6.70 x 102 m/s, and its mass is 4.68 x 10─26 kg.
(a) If it takes 3.00 x 10─13 s for a nitrogen molecule to hit a wall and rebound with the same speed but moving in the opposite direction, what is the average acceleration of the molecule during this time interval?
(b) What average force does the molecule exert on the wall?

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