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You drop a 2.3 kg textbook to a friend who stands on the ground 9 m below the textbook with outstretched hands 1.50 m above the ground.
What is the speed of the textbook when it reaches the hands?

  • physics -

    Ignoring air resistance, use conservation of energy.
    mg(H-h) = (1/2)mv²
    solve for v.

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