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**I need to get a 100 on this last Physics lab assignment, but I can't get this "rod"**

...problem :(

Help would be appreciated

(a) L

_{1}= (65 cm)/2 = 32.5 cm

"CORRECT"

(b) [(149 kg)(1) + (149 kg)(65 cm) + (149 kg)(65 cm + 32.5 cm)] / (3)(149 kg)

= (149 + 9685 + 14527.5) / (447)

= 54.5

Then,

54.5 - 32.5 = 22 cm

"INCORRECT"

-.- Help?

(c) ????

L3 _________