A weightlifter lifts a 1250 n barbell 2 m in 3 s. How much power was used to lift the barbell

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

What statements accurately describe atoms

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j