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22. The freebody diagram of the cars is shown on the right. The
force exerted by John Massis is
2
2.5
2.5(80 kg)(9.8 m/s ) 1960 N
Fm
g
==
=
.
Since the motion is along the horizontal
x
axis, using Newton’s
second law, we have
cos
,
x
Fx
F
Ma
θ
where
M
is the total
mass of the railroad cars. Thus, the acceleration of the cars 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, Force, Mass

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