In case a in Figure Q7.15, block A is accelerated across a frictionless table by a hanging 10 N weight (1.02 kg). In case b, block A is accelerated across a frictionless table by a steady 10 N tension in the string. The string is massless, and the pulley is massless and frictionless. Is A’s acceleration in case b greater than, less than, or equal to its acceleration in case a? Explain.

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Case a Case b A A 10 N tension 10 N