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  4. The potential energy of a particle of mass m is given by U=(1/2) k x2 for x<0 and U=0 for x ≥ 0. If total mechanical energy of the particle is E. Then its speed at x=√(2 E/k) is :

Q. The potential energy of a particle of mass is given by for and for . If total mechanical energy of the particle is . Then its speed at is :

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Solution:





For ,

[As ]

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