First slide

Work

Question

A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is (in J)

Moderate

Solution

$W = \frac{1}{2} k (x_{2}^{2} - x_{1}^{2}) = \frac{1}{2} \times 800 \times (15^{2} - 5^{2}) \times 10^{- 4} = 8 J$

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