A block of mass \( m \), height \( 2 h \) and width \( 2 b \) rests on a flat car which moves horizontally with constant acceleration a (see figure). (Given, \( b=0.6 \mathrm{~m}, h=0.9 \mathrm{~m}, \mu=0.5 \) and \( \mathrm{g}=9.8 \mathrm{~ms}^{-2} \) )
The shortest distance in which it can be stopped from a speed of \( 72 \mathrm{kmh}^{-1} \) with constant deceleration so that the block is not disturbed is
(a) \( 25.23 \mathrm{~m} \)
(b) \( 35.28 \mathrm{~m} \)
(c) \( 40.82 \mathrm{~m} \)
(d) \( 52.32 \mathrm{~m} \)
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