23. A sliding ladder A 13-ft ladder is leaning against a house when its base starts to slide away - YouTube
A 13-m long ladder is leaning against a wall. The bottom of the ladder is pulled along the ground - YouTube
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Iant Ladders Velocity M13 13 Ft Multiposition Ladder Aluminum Type 1A 300 Lbs | eBay
TB Davies 13-Tread Steel Pole Ladder | Not Branded | Standard Ladders | Arco
The bottom of a 13-foot straight ladder is set into the ground 5 feet away from a wall. When the top of the ladder is leaned against the wall, what is the