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As shown in the figure ,a person is pull...

As shown in the figure ,a person is pulling a mass 2kg from ground on fixed rough surface upto the top of surface with the help of a light inextensible string. The work done in joule by tension in the string is 10x,if height of the surface is 1m from ground, length of base of the surface is 2.5m and friction coefficient is 0.4. Find the value of x. Assume that the block is pulled with negligible velocity . (assume g=10 SI units)

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