Do as instructed: a. Simulate m1 = m2 with their respective velocities v1 = v2. Take a screenshot of the simulation. Explain the collision, reaction, and motion of the two masses. Here is the direct link to the simulator -  https://ophysics.com/e2.html

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Q: m1 m2

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.