phsical

posted by abu

A ball is tossed vertically upward from a height of 2 m with an initial velocity
of 10 m/s. Just before the ball hits the ground, its velocity will be what?

  1. Henry

    Vf^2 = Vo^2 + 2gd,
    d = ((Vf^2-Vo^2) / 2g) + 2,
    d=((0-100) / -19.6) + 2=5.1 + 2 =7.1m
    = Distance from Gnd.

    Vf^2 = Vo^2 + 2gd,
    Vf^2 = 0 + 2*9.8*7.1 = 139.16,
    Vf = 11.8m/s.

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