A uniform plank of length 5.8 m and weight 202 n rests, Ask an Expert

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Q. Maricruz slides a 68 kg crate, m, up an inclined ramp 2.0 m long and attached to a platform 1 m above floor level. A 415 N force, F, parallel to the ramp, is needed to slide the crate up the ramp at a constant speed. How much work does Maricruz do in sliding crate up the ramp?

Q. A uniform plank of length 5.8 m and weight 202 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the Illustrataing). To what distance x can a person who weighs 441 N walk on the overhanging part of the plank before it just begins to tip?

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