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If a load of mass 10N stretched a cord by 1.2cm, what is ...

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

View answer & explanation

Correct answer is A

Work done on a stretched cord
= Average force x extension
= $\frac{1 \times 10 \times 0.012}{2}$
= 6.0 x 10 $^{-2}$ J

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