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Three objects are placed on a massless seesaw. A $1 kg$ object is placed at $x = 3 m$ and a $2 kg$ object at $x = -2 m$. The fulcrum of the seesaw is at $x = 0m$.
Which of the following mass / location combinations would balance the seesaw?
No additional weights are necessary.
$m = 0.25 kg, x = -4 m$
$m = 3 kg, x = 0.5 m$
$m = 2 kg, x = 0.5 m$
$m = 1 kg, x = -1 m$