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18. (a) Summing the
x
components, we have
20 m +
b
x
– 20 m – 60 m =
−
140 m,
which gives
80 m.
x
b
=−
(b) Summing the
y
components, we have
60 m – 70 m +
c
y
– 70 m = 30 m,
which implies
c
y
=110 m.
(c) Using the Pythagorean theorem, the magnitude of the overall displacement is given by
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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