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physics

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a ball is thrown horizontally -> from the roof of a building 45.0 meters tall and lands 24.0 meters from the base. what was the balls initial speed?


OTHER QUESTION

a shotputter throws the shot with an initial speed of 15.5 m/s @ 34 degrees. calculate the horizontal distance thraveled by the shot if it leaves the hand at a height of 2.20 meters above the ground.

  • physics -

    like this one:
    http://www.jiskha.com/display.cgi?id=1224543292

  • physics -

    not exactly. I'm trying to find the iitial velocity, while in the other problem it is given.

  • physics -

    shot putter
    initial vertical velocity Vo = 15.5 sin 34 = 8.67
    initial and always horizontal velocity U = 15.5 cos 34 = 12.9
    initial z = 2.2
    final z = 0
    acceleration = -9.8
    so
    0 = 2.2 + 8.67 t -4.9 t^2
    t = 2 seconds
    in 2 seconds it goes 12.9*2 = 25.8

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