Physics

Maximum rang to which a boy can throw a ball is 40m maximum hight the bal atain

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  1. 40 = u T
    so
    T = 40/u

    v = Vi - 9.8 t
    at top v = 0
    t = Vi/9.8 at top. This is at time t = T/2 = 20/u
    so
    20/u = Vi/9.8
    u Vi = 196
    now max range at 45 degrees
    so
    u = Vi
    Vi = sqrt 196 = 14 = sqrt(2 g h)
    196 = 2 * 9.8 * h
    h = 10 meters

    why is range max at 45 degrees?
    http://www.wired.com/2010/09/maximum-range-in-projectile-motion/

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