46. (a) Since constant speed implies
Δ
K
0,
=
we require
WW
ag
=−
, by Eq. 715. Since
W
g
is the same in both cases (same weight and same path), then
2
9.0 10
a
W
=×
J just as it
was in the first case.
(b) Since the speed of 1.0 m/s is constant, then 8.0 meters is traveled in 8.0 seconds.
Using Eq. 742, and noting that average power is
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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

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