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8.
REASONING AND SOLUTION
From Equation 2.9,
22
0
2
vv
a
x
=+
Since the arrow starts from rest,
v
0
= 0 m/s.
In both cases
x
is the same so
2
11
1
2
2
2
2
2
or
2
va
x
a
ax a
v
a
v
==
=
Since
F
=
ma
, it follows that
a
=
F
/
m
.
The mass of the arrow is unchanged, and
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 Spring '08
 SOFFER

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