the worker knows that the lower crate has a mass of 50 kg and the upper mass of 10 kg.

the worker knows that the lower crate has a mass of 50 kg and the upper mass of 10 kg. she finds that if she pulls with a force of 120 N at an angle of 60 degrees she can keep the crates sliding at a constant speed. can you use this information to find the coefficient of friction between the lower crate and the floor? if you can , do it. if you can't, explain why not