Question

. In the arrangement shown, the normal reaction
between the block A and ground is​

Answer 1

Let the acceleration of A be a_1 downwards and that of B be a_2 upwards.

Constraint equation says that,

a_1 - a_2 = 0 => a_1 = a_2 = a (Say)

Let the tension on the string be T, and the normal reaction between the block A and the ground be R.

From the FBD of the block B,

T - 2g = 2a

=> T = 2(g + a) → (1)

From the FBD of the block A,

4g - T - R = 4a

=> R = 4g - 4a - T

=> R = 4g - 4a - 2g - 2a [From (1)]

=> R = 2(g - 3a)

I wish this would be the answer.