An iron block of mass \( 5 \mathrm{~kg} \) is kept on a trolley. If the trolley is being pushed ...

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An iron block of mass \( 5 \mathrm{~kg} \) is kept on a trolley. If the trolley is being pushed with an acceleration of \( 5 \mathrm{~m} / \mathrm{s}^{2} \), What will be the force of friction between the block and the trolley surface (Take the coefficient of static friction between the block and the surface to be 0.8)
[DUMET 2010]
(a) Zero
(b) \( 5 \mathrm{~N} \)
(c) \( 4 N \)
(d) \( 25 \mathrm{~N} \)
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