First slide
Concept of potential energy
Question

A rod of mass ‘8kg’ hinged at 0 is kept in equilibrium with a spring of force constant  100Nm1 as shown in figure. The potential energy stored in the spring is _________J

Moderate
Solution

mgl2= F. lF=mg2U=F22k=m2g24×2k=64×1008×100

U=8J

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