A student lifts a set of books off a table and places them in the upper shelf of a book case which is 2 meters above the table. If she applies a force of 5 newtons to lift these books, what is the work done?
A.
0 joules
B.
2.5 joules
C.
-2.5 joules
D.
10 joules
E.
-10 joules

Question

A student lifts a set of books off a table and places them in the upper shelf of a book case which is 2 meters above the table. If she applies a force of 5 newtons to lift these books, what is the work done?
  A. 
0 joules
  B. 
2.5 joules
  C. 
-2.5 joules
  D. 
10 joules
  E. 
-10 joules

jason78687 · Answer

Use Work=F.SCos@ where @ is angle between applied force and direction of motion