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## Homework Statement

A cube with 1 kg mass is put on top of a bigger cube with 3kg mass and 1 meter edges.

If 10 N force is exerted on the bigger cube, while the maximum friction between the cube surface is 2 N, and g=10m/s^2 , then at one time the small cube will fall to the floor.

The time needed for the small cube to reach the floor since the force is exerted is about ...

(Assume there is no friction between the floor and the big cube)

A. 1 s

B. 1.4 s

C. 1.7 s

D. 2.4 s

E. 2.7 s

## Homework Equations

Newton's law of motions

Kinematics

## The Attempt at a Solution

Free-body diagram for block A

A ----> F (friction between A and B) = 2N

Free-body diagram for block BF(friction between A and B) = 2N <-------B --------> F = 10 NThen, I get stuck..

Please help