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Homework Help: Hammer Projectile Motion

  1. Sep 3, 2009 #1
    1. The problem statement, all variables and given/known data

    A worker on the roof of a house drops his hammer, which slides down the roof at a constand speed of 4 m/s. The roof makes an angle of 30 degrees with the horizontal, and its lowest point is 10 m from the ground.

    A-find the time it takes to hit the ground
    b- what is the range

    2. Relevant equations

    v(x) = 4cos-30 = 3.464
    v(y) = 4sin-30 = -2

    3. The attempt at a solution

    Just want someone to verify my work

    y = y(initial) + v(y)t + .5gt
    0 = 10 - 2t - 4.9t, t = 1.239s

    x = x(initial) + v(x)t
    x = 3.464(1.239) = 4.291 m
  2. jcsd
  3. Sep 3, 2009 #2


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    Homework Helper

    Your solution is correct.
    But in the equation
    y = y(initial) + v(y)t + .5gt
    it should by
    y = y(initial) + v(y)t + .5gt^2
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