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 1`g=10" ms"^(-2)`.
The maximum acceleration of the car, for the box to remain stationary, is

Options

A. `8" ms"^(-2)`
B. `6" ms"^(-2)`
C. `4" ms"^(-2)`
D. `2" ms"^(-2)`

Answer

D

Explanation

Given m = 2 k.g
`mu=0.2" and "g=10" m"//"s"^(2)`
`a=mug`
`a=0.2xx10impliesa=2"m"//"s"`