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5 . There are two elevators in Tracy Hall, side by side, so that one string tied to the left elevator goes up to a

5 .

There are two elevators in Tracy Hall, side by side, so that one string tied to the left elevator goes up to a pulley and then over to the elevator on the right

so when one elevator goes up

,

the other goes down. If the left elevator is

1000

,

and the right elevator is

600

,

what is the acceleration of the pair of elevators?

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