Posted by **Lindsay** on Tuesday, November 27, 2007 at 8:57pm.

A man stands on a scale in an elevator that is accelerating upward. The scale reads 731.6 N. When he picks up a 35.0 kg box, the scale reads 1108.2 N. The man weighs 68 kg. What is the acceleration of the elevator?

What do I need to do in order to solve this?

- Physics -
**bobpursley**, Tuesday, November 27, 2007 at 9:04pm
scalereading= mg + ma where m is the mass involved.

- Physics -
**Lindsay**, Tuesday, November 27, 2007 at 9:12pm
m is 68 kg?

- Physics -
**bobpursley**, Tuesday, November 27, 2007 at 9:16pm
m is 68 when scale reading is 731.6

731.6=68(9.8+a)

1108.2=103(9.8+a)

solve for a. You could have done it with either equation, whomever wrote the problem should not have given the mans mass, that way, you would have had two equations with two unknowns.

- Physics -
**Lindsay**, Tuesday, November 27, 2007 at 9:25pm
I come up with 0.96 m/s^2. Is this correct?

- Physics -
**Lindsay**, Tuesday, November 27, 2007 at 9:36pm
N/m I finally got it. Thanks for all your help. :)

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