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However, our approach will not assume constant acceleration; we use energy
conservation:
0
22
0
00
2(
)
11
GM r
r
GMm
GMm
mv
mv
v
rr
r
r
−
−=−
¡
=
which yields
v
= 1.4
×
10
6
m/s.
(b) We estimate the height of the apple to be
h
= 7 cm = 0.07 m. We may find the answer
by evaluating Eq. 1311 at the surface (radius
r
in part (a)) and at radius
r
+
h
, being
careful not to round off, and then taking the difference of the two values, or we may take
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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, Energy

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