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103. We use SI units so
m
= 0.030 kg and
d
= 0.12 m.
(a) Since there is no change in height (and we assume no changes in elastic potential
energy), then
Δ
U
= 0 and we have
23
mech
0
1
3.8 10 J.
2
EKm
v
Δ=
Δ
=
−
=
−
×
where
v
0
= 500 m/s and the final speed is zero.
(b) By Eq. 833 (with
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 Spring '08
 Any
 Physics, Energy, Potential Energy

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