A box of mass 2 kg is placed on the roof...

A box of mass 2 kg is placed on the roof of a car. The box would remain stationary until the car attains a maximum acceleration. Coefficient of static friction between the box and the roof of the car is 0.2 and `g=10ms^(-1)`.
This maximum acceleration of the car, for the box to remain stationary, is

`8ms^(-2)`

`6ms^(-2)`

`4 ms^(-2)`

`2ms^(-2)`

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