A box with weight 40 N is on a rough horizontal surface. An external force F is

Question

A box with weight 40 N is on a rough horizontal surface. An external force F is applied horizontally to the box. A normal force and a friction force are also present, denoted by n and f. A force diagram, showing the four forces that act on the box, is shown in Figure 5.7. When force F equals 8.8 N, the box is in motion at constant velocity. The box decelerates when force F is removed. The magnitude of the acceleration of the box is closest to:

A) 2.2 m/s2

B)1.7 m/s2

C) .55 m/s2

D) Zero

E) 1.1 m/s2

Explanation / Answer

value of n= 40N
value of N =8.8N

value of m= 40/9.8

value of accleration = 8.8/4.08

=2.156

= 2.2 m/s^2

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