What is the kinetic energy of the ball as it is half way through the fall?

fire could start, buildings collapsing, and ash falling from the sky.

explanation:

this is because the buildings or plants could catch on fire and the buildings would most likely collapse. lastly ash would fall because all the burning would cause ash to fall from the sky.

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explanation:

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answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.