Tang shu, to tell you the truth, I don't carry a scale to measure the rope pulled and the load lifted. But in our jhum field, a single movable pulley makes lifting a sack of fertilizer much easier. For your book answer, the mechanical advantage is 2, velocity ratio is also 2, and efficiency is less than 100% because of friction. But here, the real 'efficiency' drops when my nephew, who is pulling, gets distracted by a mango and lets the sack swing—that's the practical lesson no book will give you.
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