One end of a light inextensible string is attached to a block. The string is used to pull the block along a horizontal surface with a speed of $2{\text{ }}m{\text{ }}{s^{ - 1}}$. The string makes an angle of ${20^ \circ }$ with the horizontal and the tension in the string is $25{\text{ }}N$. Find the work done by the tension in a period of 8 seconds.
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