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A block of mass \( m \), height \( 2 \mathrm{~h} \) and width \( 2 \mathrm{~b} \) 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 \( g=9.8 \mathrm{~ms}^{-2} \) )
W.
The value of the acceleration at which block topples about point \( A \) assuming sufficient friction to prevent slipping is
(a) \( 5.53 \mathrm{~ms}^{-2} \)
(b) \( 6.53 \mathrm{~ms}^{-2} \)
(c) \( 7.23 \mathrm{~ms}^{-2} \)
(d) \( 4.52 \mathrm{~ms}^{-2} \)
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