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A block is placed at distance of 3m from the rear on the floor of a truck $(g = 10 m s^{- 2}) .$ When the truck moves with an acceleration of $8 m s^{- 2},$ the block takes 2 sec to fall off from the rear of the truck. The coefficient of sliding friction between truck and the block is

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0.95

0.85

0.75

0.65

answer is A.

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Detailed Solution

$t = \sqrt{\frac{2 ℓ}{a - μ g}}$

$4 = \frac{6}{8 - 10 μ}$

$32 - 40 μ = 6$

$26 = 40 μ$

$μ = \frac{26}{40} = 0.65$

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