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. The coefficient of static friction between the box and the roof of the car is 0.2 and g =10 ms-2. The maximum acceleration of the car, for the box to remain stationary, is

1) 8 ms-2

2) 6 ms-2

3) 4 ms-2

4) 2 ms-2

Answer: 4) 2 ms-2

Solution:

ma = μmg

a = μg = 0.2 x 10

= 2 m/s2

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