Question

select the correct answer.
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

Explanation:

Step1: Recall Work Formula

Work \( W \) is calculated as \( W = F \times d \), where \( F \) is force and \( d \) is displacement in the direction of force.

Step2: Identify Values

Force \( F = 5 \, \text{N} \), displacement \( d = 2 \, \text{m} \) (same direction as force).

Step3: Calculate Work

Substitute into formula: \( W = 5 \times 2 = 10 \, \text{joules} \).

Answer:

D. 10 joules