First slide

Work

Question

A force 100N produces an elongation of 20cm in a spring. The work done against spring force is

Moderate

A

1J
B

5J
C

10J
D

20J

Solution

$W=U= \frac{1}{2} F . x = \frac{1}{2} \times 100 \times \frac{20}{100} = 10 J$

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