Q.

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

A. 8j
B. 16j
C. 24j
D. 32j
Answer» A. 8j
Explanation: at x1 = 5 cm, u1=1/2×k(x1)2=1/2×800×0.052=1j
3.5k
0
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