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physics

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A man fires a rock of a slingshot directly upward.The rock has an initial velocity of 15m/s.How long will it take for the rock to return to the level he fired it at?

  • physics -

    Use the third formulae of calculating the displacement.ur initial velocity is 15m/s ,ur final velocity is 0m/s,ur displacement is 0m .substitute this values and solve time

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