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Dimensions of U are (Hint: U stands for absolute potential energy)
Difficulty: Easy
A: 
$[M^{}L^{2}T^{-2}]$
B: 
$[M^{}L^{3}T^{-1}]$
C: 
$[M^{2}L^{2}T^{}]$
D: 
$[M^{}L^{-1}T^{-2}]$
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