In the system shown in the figure, the b...

In the system shown in the figure, the block is pulled by applying a force of 40 N on the other end of the string. If the kinetic energy of the block increases by 40 J in a given interval of time then work done by tension on the block is `(g = 10 ms^(-2))`

40 J

80 J

Zero

20 J

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