Question

A vehicle is moving on a road with an acceleration a=20 m/s2. The frictional coefficient between the block of mass m and the vehicle so that block does not fall downward is?​

Answer 1

As the mass not fallen down so, the net force will be zero.

We know,  

fr = mg

F = R

Fr = μR

and μ is frictional coefficient

fr = mg

μR = mg

μma = mg

μ = g/a

μ = 10/20

μ = 0.5

Answer 2

Answer:0.5

Explanation:

Refer pic