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Need help with projectiles initial velocity using height and distance

  1. Jul 20, 2014 #1
    home run that was estimated to have
    landed 180 metres from the home plate and to have reached a
    height of 21.3 metres. Calculate the initial velocity of the
    ball.

    u^2=v^2-2as

    t=?
    u=?
    v=0
    s=180
    a=g= -9.8

    u^2= √0^2-2x-9.8x180
    u= 59.9 m/s


    am I using the right equation for this problem. I am not sure if I have to find the angle using the height and the range of the ball to help find the initial velocity. just want to know if this is the right direction with this problem
     
  2. jcsd
  3. Jul 20, 2014 #2

    ehild

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    Homework Helper
    Gold Member

    What are u and v? What is s? And why do you not use the maximum height? Does the ball move horizontally? If so, is g the horizontal acceleration? Does not accelerate Earth the objects vertically?

    ehild
     
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