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determine the speed just before blocks collide

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How do you determine the speed just before blocks collide? How do you determine the temperature rise that results from the collision? How do you determine the additional thermal energy that is generated as the blocks continue to move together after the collision?

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Forces behind collisions are determined.

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First, to determine the speed just before collision, you need to know how the two blocks were moving initially. That is, you need to know their initial velocities, accelerations, or/and if they experience any external forces. ...

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