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Math Help - I can't get time, with formulas, help please.

  1. #1
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    I can't get time, with formulas, help please.

    Hey There,
    A golf ball rolls off a horizontal cliff with an Vo speed of 11.4 m/s. The ball falls a vertical distance of 15.5 m into a lake below.
    It asks a) how much time does the ball spend in the air
    b) what is the speed v of the ball just before it strikes the water?

    I solved for B the V as 20.82 m/s.w
    I got Vo = -11.4, d = -15.5 m, a= -9.8 m/ss.

    I tried every way to get time of 1.78 s using all formulas that I can and for some reason I am coming up short in time.
    What am I doing wrong. Just pluncking the numbers and nothing.
    HELP?
    Tks
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  2. #2
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    Quote Originally Posted by bradycat View Post
    Hey There,
    A golf ball rolls off a horizontal cliff with an Vo speed of 11.4 m/s. The ball falls a vertical distance of 15.5 m into a lake below.
    It asks a) how much time does the ball spend in the air
    b) what is the speed v of the ball just before it strikes the water?

    I solved for B the V as 20.82 m/s.w
    I got Vo = -11.4, d = -15.5 m, a= -9.8 m/ss.

    I tried every way to get time of 1.78 s using all formulas that I can and for some reason I am coming up short in time.
    What am I doing wrong. Just pluncking the numbers and nothing.
    HELP?
    Tks
    In the vertical direction (taking downwards as positive):

    a = 9.8 m/s^2
    u = 0 m/s
    d = 15.5 m
    t = ?

    Use the appropriate uniform straight line motion formula.
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