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Posted by on Tuesday, April 2, 2013 at 4:08am.

You want to figure out how fast you can throw a ball, but don't have access to a radar gun. You measure the height from the ground to your hand as you throw and discover that when you throw a ball it leaves your hand at a height of 2 m from the ground. You then throw a ball horizontally and discover that it hits the ground 20 m from where you're standing. How fast in m/s did you throw the ball?

  • PHYSIcs!!! - , Tuesday, April 2, 2013 at 5:32am

    h=gt²/2=>
    t=sqrt(2h/g).

    s=vt=>
    v=s/t=s/ sqrt(2h/g)=
    =20/sqrt(2•2/9.8)=31.3 m/s

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