PR PS review problem 2-24 vs. EK

[DAKAZA]

I've been studying almost exclusively with EK so I tried the EK nonequilibrium method on this problem. I picked the small mass as my system and set it up like this:

50N + ma = 100N

After solving for a, I came up with the wrong answer. Does anyone know why this didn't work? I know I'm screwing up the tension somehow.

Also, on the next problem (2-25), why isn't the tension 400N?

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[DAKAZA]

anyone?

 

[161927]

In a pulley system, the tension on the cord must be considered twice.

 

[DAKAZA]

In a pulley system, the tension on the cord must be considered twice.

Could you explain? I'd really appreciate it.