Question

A hollow cubical box P is moving on a smooth horizontal surface in the x–y plane with constant acceleration of vector a = 3i + 4jm/s². A block Q of mass 2kg is at rest inside the cubical box as shown in figure. lf the coefficient of fricition between the surface of the cube P and the block Q is 0.6. Then the force of fricition between P and Q is :

(A) 5 N 

(B) 8 N 

(C) 12 N 

(D) 10 N   

Answer 1

Correct option (D) 10N

Explanation:

a = √(3² + 4²) =5m/s

fricition force f = m a = 2 × 5 = 10N