Question on: JAMB Physics - 2009
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
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Correct Option: A
Work done on a stretched cord
= Average force x extension
= (10 + 0)/2 x 1.2 x 10-2
= 6.0 x 10-2J
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