If a load of mass 10N stretched a cord by 1.2cm. What is the total work done?

A. 6.0 x 10‾²J
B. 7.6 x 10‾²J
C. 1.8 x 10‾²J
D. 6.6 x 10‾²J

Correct Answer:

Option A = 6.0 x 10‾²J

Explanation

Work done on a stretched cord
= Average force x extension
= (10 + 0)/2 x 1.2 x 10‾²
= 6.0 x 10‾²J