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what is the approximate surface temperature of a main-sequence star with a luminosity 100 times as bright as the sun?

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A wrench dropped by a worker freely falls from the top of an 80m tall tower. What is the velocity of the wrench at the instant before it hits the ground? 1) What are the known quantities involved? 2) Which equation can be used to find the velocity with the given information? 3) what is the velocity of the wrench at the instant just before it hits the ground? 4) What is the total time for the wrench to hit the ground?
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