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note that
a
y
= 0 so that there is no ambiguity denoting
a
x
simply as
a
. We choose +
x
to the
right and +
y
up. We also note that the
x
component of the rope’s tension (acting on the
crate) is
F
x
=
F
cos
θ
= (450 N) cos 38° = 355 N,
and the resistive force (pointing in the –
x
direction) has magnitude
f
= 125 N.
(a) Newton’s second law leads to
2
355 N
125 N
0.74m/s .
310 kg
x
Ffm
a
a
−
−=
¡
==
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 Spring '08
 Any
 Physics

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