1.

A hollow cubical box P is moving on a smooth horizontal surface in the x-y plane with constant acceleration of `vec(a) = 3 hat (i) + 4 hat (j) m//s^(2)`.A block Q of mass 2 kg is at rest inside the cubical box as shown in figure. If the coefficient of friction between the surface of the cube P and the block Q is 0.6. Then the force of friction between P and Q is : A. 5 NB. 8 NC. 12 ND. 10 N

Answer» Correct Answer - D
`a = sqrt(3^(2)+4^(2))=5m//s`
Friction force `f = ma = 2 xx 5 = 10 N`


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