Physics

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If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about ?

When I use the quadratic formula, I get -8.97

  • Physics -

    How can the time be negative?

    0=10t-4.9
    0=t(10-4.9t)
    t=0, t=10/4.9 sec are the solutions

    In the quadratic equation:
    (-10+-sqrt100)/-9.8 = same answers.

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