## Answers

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consider the direction upwar das postive and downward as negative let the velocity of rock 1.0 second before it strikes the groundis =v V =v; +gt m g=-10.05 S s v; rinitial velocity=-5.0 t= time of flight before which wemeasure the velocity = 3.0 sec weplug the know values in the relation gives =>v=v;+gt =- 35.0m S proper choiceis (D) -35.0" S

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