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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Work, Power and Energy
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A particle of mass m slides a distance d down a plane inclined at $\theta$ to the horizontal. The work done by the normal reaction R is

\[(a)\;0 \quad (b)\;Rd \quad (c)\; mgd\;\cos \theta \quad (d)\;mgd\;\sin \theta\]

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Since the normal reaction R is perpendicular to the direction of displacement 'd'
$W=R. d \cos \theta$
$\quad=Rd \cos 90$
Hence a is the correct answer.


answered Aug 6, 2013 by meena.p
edited Feb 10, 2014 by meena.p

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