A block of mass 2 kg slides down on a rough inclined plane of height 3 m through a slope distance 5 m with constant speed as shown in the figure. The work done by the frictional force on the block is [Take g = 10 m/s²]
(1) 15 J (3) 45 J m 5m 0 (2) 30 J (4) 60 J
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