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Q.

If a box is lying on the floor of a wagon with a coefficient of friction 0.2, what is the maximum acceleration of the wagon for which the box would remain stationary? (Let g = 9.81 m/s2)

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a

3.92 m/s2

b

1.96 m/s2

c

2 m/s2

d

4 m/s2

answer is A.

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Detailed Solution

Let the mass of the box be “m”

ma = µmg

a = µ x g

a = 0.2 x 9.81

a = 1.96 m/s2.

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