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A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 11 m/s when the hand is 1.8 m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)

  • Physics -

    hf=hi+ vi*t-4.9t^2

    solve the quadratic equation for t.

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