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a
F
m
g
g
==
=
52
013
.
..
N
40kg
ms
2
(c) The accelerations of the sled and girl are in opposite directions. Assuming the girl
starts at the origin and moves in the +
x
direction, her coordinate is given by
2
1
2
gg
x
at
=
.
The sled starts at
x
0
= 15 m and moves in the –
x
direction. Its coordinate is given by
2
1
0
2
s
s
x
xa
t
=−
. They meet when
g
s
x
x
=
, or
22
0
11
.
gs
x
This occurs at time
t
x
aa
=
+
2
0
.
By then, the girl has gone the distance
()
2
0
2
15 m 0.13 m/s
1
2.6 m.
2
0.13 m/s
0.62 m/s
g
t
=
=
++
33. (a) Since friction is negligible the force of the girl is the only horizontal force on the
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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, Acceleration, Force, Friction, Gravity

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