This preview shows page 1. Sign up to view the full content.
14. We use Eq. 818, representing the conservation of mechanical energy. We choose the
reference position for computing
U
to be at the ground below the cliff; it is also regarded
as the “final” position in our calculations.
(a) Using Eq. 89, the initial potential energy is given by
U
i
=
mgh
where
h
= 12.5 m and
1.50 kg
m
=
. Thus, we have
1
2
KU K U
mv
mgh
mv
ii
f
f
i
+=
+
+
1
2
0
22
which leads to the speed of the snowball at the instant before striking the ground:
v
m
mv
mgh
v
gh
=+
F
H
G
I
K
J
21
2
2
where
v
i
= 14.0 m/s is the magnitude of its initial velocity (not just one component of it).
This is the end of the preview. Sign up
to
access the rest of the document.
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, Energy

Click to edit the document details