A vehicle is moving on a road with an acceleration \( a=20 \mathrm{~m} / \mathrm{s}^{2} \) as sh...

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A vehicle is moving on a road with an acceleration \( a=20 \mathrm{~m} / \mathrm{s}^{2} \) as shown in figure. The frictional coefficient between the block of mass \( (m) \) and the vehicle so that block is does not fall downward is \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
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