A block of mass $1kg$ slides down a curved track that is one quadrant of a circle of radius $1m$. Its speed at the bottom is $2m/s$. The work done by frictional force is $–nJ$. Find $n$.

Q. A block of mass $1kg$ slides down a curved track that is one quadrant of a circle of radius $1m$. Speed of the block at the bottom is $2m/s$. Work done by the frictional force on the block when it reaches at the bottom is:

Q. The block of mass $1kg$ slides down a curved track which forms one quadrant of a circle of radius $1m$ as shown in the figure. The speed of block at the bottom os the track is $v=2$ $m{s}^{-1}$. The work done by the force of friction is:

Q. A block of mass 1 kg slides down a curved track which forms one quadrant of a circle of radius 1 m as shown in figure. The speed of block at the bottom of the track is $v=2m{s}^{-1}$. The work done by the force of figure is

Q. A block of mass $1$ kg slides down a curved track which forms one quadrant of a circle of radius $1$ m as shown in figure. The speed of the block at the bottom of the track is $v=2m{s}^{-1}$. The work done by the force of friction is (Take $g=10m{s}^{-2}$ )

Q. A body of mass $2\text{kg}$ slide down a curved track which is quadrant of a circle of radius $2\text{m}$. All the surfaces are frictionless. If the body starts from rest, its speed at the bottom of the track is
$(g=10{\text{m/s}}^2)$