A block of mass \( m \), height \( 2 \mathrm{~h} \) 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 \( g=9.8 \mathrm{~ms}^{-2} \) )
Determine the value of acceleration at which slipping of the block on the car starts if the coefficient of friction is \( \mu \).
(a) \( 4.9 \mathrm{~ms}^{-2} \)
(b) \( 2.45 \mathrm{~ms}^{-2} \)
(c) \( 7.35 \mathrm{~ms}^{-2} \)
(d) \( 3.02 \mathrm{~ms}^{-2} \)
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