6.3: a factory worker pushes a 30 kg crate a distance of 4.5 malong a level floor at constant velocity by pushing horizontally onit. the coefficient of kinetic friction between the crate and thefloor is 0.25.
Suppose the worker in exercise 6.3 pushes downward at an angleof300 below the horizontal
(a) what magnitude of forcemust the worker apply to move thecrate at constatnt velocity?
(b)how mach work is done on the crate by this force when thecrate ispushed a distance of 4.5m?
(c) how mach work is done onthe crate by friction during thisdisplacment?
(d) how much work isdone on the crate by the normal force? bygravity?
(e) what is thetotal work done on the crate?
