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[" 23.An object of mass "m" slides down ...

[" 23.An object of mass "m" slides down a hill of arbilrary why "],[" and after travelling a certain horizontal path stops becily "],[" of friction.The total vertical height descended is hill "],[" friction coefficient is different for different segmently "],[" the entire path but is independent of the velocity al "],[" direction of motion.The work that a tangential forcen "],[" perform to return the object to its initial position along "],[" same path is "],[[" a."mgh," b."-mgh," c."-2mgh," d."2mgh]]

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