As a particle moves along the x axis it is acted upon by a single conservative force given by Fx = (20 - 4.0x) N where x is in m. The potential energy associated with this force has the value +30 J at the origin (x = 0). What is the value of the potential energy at x = 4.0 m?
a. -48 J
b. +78 J
c. -18 J
d. +48 J
e. +80 J
C
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