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5.Work, Energy, Power and Collision
medium
A block of mass $2\,\,kg$ is placed on a rough inclined plane as shown in the figure $(\mu = 0.2)$ so that it just touches the spring. The block is allowed to move downwards. The spring will be compressed to a maximum of

A
$0.1\,\,cm$
B
$6.6\,\,m$
C
$1\,\,cm$
D
$13\,\,cm$
Solution
By $WET$ $W_g + {W_{{f_r}}} + W_{R.F} = 0$
$mg\,\,sin\,\,30x -\mu mg\,\,cos\,30x -1/2 kx^2 = 0$
After solving $x = 13\,\,cm.$
Standard 11
Physics
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