We're asked for the acceleration and force involved in reversing a particle's velocity.
This problem involves forces in kinematics with horizontal acceleration.
Whenever we are given such a problem we apply the following steps.
For part 2, we'll need to use the kinematic equations,
Step 1: Draw a free body diagram (FBD)
We'll take a coordinate system where the positive x-axis points to the right.
Therefore, velocity before the collision with the wall is positive and velocity after the collision (rebounce) with the wall is negative.
Step 2: Apply kinematics equations and F=ma
The average speed of a nitrogen molecule in air is about 6.70×10 2 m/s, and its mass is 4.68×10−26 kg.
(a) If it takes 3.00×10−13 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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