Manya has a spring balance whose scale is calibrated to read in kilograms so that when she hangs a block on it, the scale reads .
Now, she arranges a setup with two blocks of each, as shown in the diagram below.
What will be the reading of the spring balance?
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The scale reads the tension in the string. The tension in the string is 10kg. This is the force the string must exert up on either of the 10-kg weights at either end of the string.