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2)energy at end=K.E=1/2mv^2=320J
3)Yes energies are different because friction resists against movement due which there is energy loss.No it does not violate law of conservation of energy because the total energy at beginning =energy at end+loss in enegy due to friction.
4)work done =change in K.E=1/2m(v^2-u^2)=320J