(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in Fig. 5.3.( a verticle strand of 4 balls with mass 5,10,15,and 20 kg with the pull at the top) A, B, and C are the tensions in the connecting cords.

the pull P is closest to:

290 N

690 N

50 N

200 N

490 N

2. Relevant equations

F= ma

3. The attempt at a solution

treating the weights as one mass

Pull-mg=ma

pull=m(a+g)

= 552

Which is not one of the answers. What is the error in my logic?

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# Homework Help: Force Problem with weights

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