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20. We take rightwards as the +
x
direction. Thus,
1
ˆ
(20 N)i
F
=
G
. In each case, we use
Newton’s second law
G
G
G
FFm
a
12
+=
where
m
= 2.0 kg.
(a) If
2
ˆ
(1
0
m
/
s)
i
a
=+
G
, then the equation above gives
G
F
2
0
=
.
(b) If ,
2
ˆ
(2
0m
/
s)
i
,
a
=+
G
then that equation gives
2
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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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