A 75.0-kg painter climbs a ladder that is 2.75 m long and leans against a vertical wall. The ladder makes a 30.0o angle with the wall. (a) How much work does gravity do on the painter? (b) Does the answer to part (a) depend on whether the painter climbs at constant speed or accelerates up the ladder?

Solution 5E Step 1 of 3: The displacement is upward along the ladder and the gravity force is downward so = 180 30 0 w = mg = 735 N s = 2.75 m Step 2 of 3: a) The gravity force is constant and the displacement along straight line so W = Fs cos 0 = 735 × 2.75 × cos 150 = 1750 J