A man is pulling a string connected to a block of mass m as shown in the figure along side. During motion of the block,

Q: A man is pulling a string connected to a block of mass m as shown in the figure along side. During motion of the block,

Numerical

(a) The work done by the string on the block is positive

(b) The work done by the man on the string is negative

(c) The work done by string on the man is zero

(d) The net work done on the block must be positive

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Ans: (a) , (c)