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# Work, Kinetic Energy and Potential Energy

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6.2. WORKED EXAMPLES
153
and:
F
y
= -
U
y
= -
y
(3x
3
y - 7x)
= -(3x
3
) = -3x
3
Then in unit vector form, F is:
F = (-9x
2
y + 7)i + (-3x
3
)j
where, if x and y are in meters then F is in newtons. Got to watch those units!

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Summary :

## WORKED EXAMPLES 153 and: F y = - U y = - y (3x 3 y - 7x) = -(3x 3 ) = -3x 3 Then in unit vector form, F is: F = (-9x 2 y + 7)i + (-3x 3 )j where, if x and y are in meters then F is in newtons.

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