A particle of mass 2 kg is attached to one end of a light elastic string of

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A particle of mass 2 kg is attached to one end of a light elastic string of natural length 1.5m and modulus of elasticity 50N. The other end of the string is attached to a fixed ceiling and the particle is allowed to rest, hanging in equilibrium. The particle is then pulled down 0.3m and released. Find the speed of the particle after it has travelled 0.4m upwards.

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