An 2Bm (b being a positive number) meter ladder is leaned against a church wall. A cat is tied to the bottom of the ladder. It spots a mouse and moves towards it at a constant speed of 2m/s, pulling the ladder with it. At what speed does the ladder slide along the wall when the bottom of the ladder is 8m above the ground?

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b ? m/sec 2b avec 2 m/sec b70