Question

A spring has a spring constant of 800 N/m. How much work must be done to stretch the spring 0.4 m from its unstretched position?

A. 64.0 J
B. 160.0 J
C. 320.0 J
D. 640.0 J

Answer 1

A. 64.0 J

Step-by-step explanation:

Given parameters:

Spring constant = 800N/m

Extension = 0.4m

Unknown:

Work done = ?

Solution:

The work done in a string is given as:

Work done =
`(1)/(2)` x 800 x 0.4² = 64J