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An external unknown horizontal force F p...

An external unknown horizontal force F pulls a smooth block of mass m attached with an ideal spring of stiffness k. Block is initially at rest and spring is relaxed. Find the work done (in J) by the force F, when the block moves with a velocity v and the deformation of the spring is x (k = 25 N/m, v = 1 m/s, m = 1 kg, x =20 cm)

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