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Kinematics - Stone Collide in the Air

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A small stone falls freely from height h. T seconds later another one is thrown downwards with speed v0, from the same height h. What should be the minimum value of v0 if it is expected that the stones collide in the air?

[answer: v0(h, T, g), where g = acceleration of gravity].

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The solution determines what should be the minimum value of v0 if it is expected that the stones collide in the air?

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