Can anyone check it?

block a weighs 1.40 n, and block b weighs 4.20 n. the coefficient of kinetic friction between all surfaces is 0.30. find the magnitude of the horizontal force necessary to drag block b to the left at constant speed if a and b are connected by a light, flexible cord passing around a fixed, frictionless pulley.

2.52 N

Explanation:

Since, Block B needs to be dragged at constant speed, it means net force on it would be zero. The tension T would  act in the string connecting the two blocks. Frictional force would act on both the contact surfaces of block B.

Refer to Free body diagram:

F - T - f₁ - f₂ = 0

⇒F =- T + f₁ + f₂

From block A,

Thus,

Inserting the values:

c) up

hope this