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A small block of mass \( 1 \mathrm{~kg} \) is released from rest at the top of a rough track. The track is a circular arc of radius \( 40 \mathrm{~m} \). The block slides along the track without toppling and a frictional force acts on it in the
\( \mathrm{P} \) direction opposite to the instantaneous velocity. The work done in overcoming the friction up to the

W point Q, as shown in the figure below, is \( 150 \mathrm{~J} \). (Take the acceleration due to gravity, \( \mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2} \) )
The speed of the block when it reaches the point \( \mathrm{Q} \) is
(A) \( 5 \mathrm{~ms}^{-1} \)
(B) \( 10 \mathrm{~ms}^{-1} \)
(C) \( 10 \sqrt{3} \mathrm{~ms}^{-1} \)
(D) \( 20 \mathrm{~ms}^{-1} \)
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