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Phy 231
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A 70 gram ball rolls off the edge of a table and falls freely to
the floor 122 cm below. While in free fall it moves 40 cm in the
horizontal direction. At the instant it leaves the edge it is
moving only in the horizontal direction. In the vertical
direction, at this instant it is moving neither up nor down so
its vertical velocity is zero. For the interval of free fall:
What are its final velocity in the vertical direction and its
average velocity in the horizontal direction?
answer/question/discussion: ->->->->->->->->->->->-> :
vf^2 = -2g(ds)
vf^2 = -2 (9.8 m/sec) * (-1.22 m)
vf = 4.89 m/sec
vf = v0 + at
4.89 m/sec = 0 + 9.8 m/sec^2 * t
t = 0.498 sec
Horizontal
v_Ave = ds/st
V_Ave = 0.4 m / 0.498 sec
V_Ave = 0.80 m/sec
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Assuming zero acceleration in the horizontal direction, what are
the vertical and horizontal components of its velocity the
instant before striking the floor?
answer/question/discussion: ->->->->->->->->->->->-> :
Vertical is 4.89 m/sec
Horizontal is 0.80 m/sec
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&#Very good responses. Let me know if you have questions. &#