Pulleys...Physics question...help?

COY

New member
Two 40N weights are joined together by a spring scale, rope, and pulleys.
What mass does the spring scale measure? Explain.
 
Just so you know, spring scales will not measure mass. They measure force. If it is calibrated in kilograms or grams, it is using these as pseudo-units of force. Spring scales should be calibrated in Newtons or pounds.
 
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