A block of mass $1 \,kg$ slides down on a rough inclined plane of inclination $60^°$ starting from its top. If the coefficient of kinetic friction is $0.5$ and length of the plane is $1 \,m$, then work done against friction is ........ $J$
A block of mass $1 \,kg$ slides down on a rough inclined plane of inclination $60^°$ starting from its top. If the coefficient of kinetic friction is $0.5$ and length of the plane is $1 \,m$, then work done against friction is ........ $J$
$9.82$
$4.94$
$2.45$
$1.96 $
A block of mass $1 \,kg$ slides down on a rough inclined plane of inclination $60^°$ starting from its top. If the coefficient of kinetic friction is $0.5$ and length of the plane is $1 \,m$, then work done against friction is ........ $J$
$W = \mu mg\cos \theta \,S = 0.5 \times 1 \times 9.8 \times \frac{1}{2} \times 1 = 2.45\;J$
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