A small block of mass \( 1 \mathrm{~kg} \) is released from rest at...

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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 direction opposite to the
P
W instantaneous velocity. The work done in overcoming the friction up to the point \( Q \), as shown in the figure, is \( 150 \mathrm{~J} \). (Take the acceleration due to gravity, \( g=10 \mathrm{~ms}^{-2} \) ) (2013 Adv.)
The speed of the block when it reaches the point \( Q \) 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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