K. if anyone is able to help me with this problem, that would be great. A student carries a 1.0 kg physics book 3.0 m across the room, then lifts it 1.5 m to put it on a shelf. The entire task takes 20 s. a) what is the total work done on the book? b) what is the change in potential energy of the book? c) what is the power output of the student? d) if the book falls off the shelf a distance of 2.5 m to the floor, how much kinetic energy will it have when it hits the floor? e) what is the speed of the book as it hits the floor? i was able to do part c, but the rest is driving me nuts! Please help!