physics

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A stone is thrown straight up from the ground with an initial speed of 30.5 m/s . At the same instant, a stone is dropped from a height of h meters above ground level. The two stones strike the ground simultaneously.Find the height h. gravity is 9.8 m/s2 .
Answer in units of m
The acceleration of

  • physics -

    t(up) = (Vf - Vo) / g,
    t(up) = (0 - 30.5) / -9.8 = 3.11m.

    t(dn) = t(up) = 3.11s.

    T=t(up) + t(dn) = 3.11 + 3.11 = 6.22s =
    Time in flight.

    The 2 stones were in flight for the same period of time:

    T1 = T2 = 6.22s.

    h = Vo*t + 4.9t^2,
    h = 0 + 4.9*(6.22)^2 = 189.6m.

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