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4.
REASONING AND SOLUTION
The acceleration is obtained from
x
=
v
0
t
+
1
2
at
2
where
v
0
= 0 m/s. So
a
= 2
x
/
t
2
Newton’s second law gives
()
22
218
m
2
72 kg
2900 N
0.95 s
x
Fm
am
t
⎡⎤
⎛⎞
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 Spring '08
 SOFFER

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