The potential energy of a long spring when stretched by 2 cm is \(U\). If the spring is stretched by 8 cm, potential energy stored in it will be :
Potential energy of spring, conservation of mechanical energy, conservative and non-conservative forces
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A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively :