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AP® Physics C: Mechanics

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Moderate

A See-Saw Problem

APPHMC-DJNEVA

A massless meter stick is in equilibrium about its center point.

If a mass, $m_1=50g$, is placed at the 30cm mark and a mass, $m_2= 75g$, is placed at the 70cm mark, where must a mass, $m_3= 50g$, be placed to keep the system in equilibrium?

A

$10 cm$

B

$40 cm$

C

$50 cm$

D

$60 cm$

E

$90 cm$