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  3. The potential energy of a particle of mass m free to move along x-axis is given by

. The potential energy of a particle of mass m free to move along x-axis is given by

U= 1/2kx2, for x < 0 and U = 0 for (x denotes the x-coordinate of the particle and k is a positive constant). If the total mechanical energy of the particle is E, then its speed at  as

as

Best Answer

Ans: A

Sol: From conservation of energy

KE + PE = E     

eex    

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