(II) A person exerts a horizontal force F of modulus 240 N on a 38 kg box that moves 2.1 m up an inclined plane (=4). Find the work done on the cash register (a) by the person; (b) by the frictional force if c=0,23 and (c) by the force of gravity. (d) Find the module of the final speed if the body starts from rest.