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A quarterback claims that he can throw the football a horizontal distance of 196.6 m (215 yd). Furthermore, he claims that he can do this by launching the ball at the relatively low angle of 30° above the horizontal. To evaluate his claim, determine the speed with which this quarterback must throw the ball.

  • physics -

    Given a kickoff of velocity v at angle a, the range is given by

    R = v^2 sin(2a)/g
    196.6 = v^2 * .866 / 9.8
    v^2 = 2224.8
    v = 47.17m/s

    v =~ 170km/hr, not too likely, especially since no quarterback would be discussing distances in meters!

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