A block of mass \( m \) slides along the track with kinetic friction \( \mu \). A man pulls the ...

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A block of mass \( m \) slides along the track with kinetic friction \( \mu \). A man pulls the block through a rope which makes an angle \( \theta \) with the horizontal as shown in the figure. The block moves with constant speed \( v \). Power delivered by man is
(a) \( T v \)
(b) \( T v \cos \theta \)
(c) \( (T \cos \theta-\mu m g) v \)
(d) Zero
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