Question

2. A 75.0-kg painter climbs a ladder that is 2.75 m long leaning against a vertical wall. The ladder makes a 30.0° angle with the wall.
(a) How much work does is done by gravity on the painter?


(b) Does the answer to part (a) depend on whether the painter climbs at constant speed or accelerates up the ladder?

Answer 1

a. work=force.distance where the dot means cosine of angle between them
work=mg*2.75 cosine30 that is the work done by the painter, the work done by gravity is the negative of that.

Answer 2

a painter climbs a ladder that is 2,75 m long leaning against a vertical wall.the ladder makes 30 degrees with the wall.how much work does gravity do on the painter