Need help with number 4 ooo T-Mobile 5:46 PM 40%) O a flipitphysics.com A box re

Question

Need help with number 4
ooo T-Mobile 5:46 PM 40%) O a flipitphysics.com A box rests on top of a flat bed truck. The box has a mass of m 23 kg The coefficient of static friction between the box and truck is s-0.88 and the coefficient of kinetic friction between the box and truck is k 0.69 The truck accelerates from rest to vf- 18 m/s in t-15 s (which is slow enough that the box will not slide). What is the acceleration of the box? 1.2 Your submiss 1.2 Computed value: 1.2 Feedback: Correct! ubmitted Sunday, July 8 at 5:49 PM In the previous situation, what is the frictional force the truck exerts on the box? 27.6 Your submiss 276 Computed value: 27.6 Feedback: Correct! Submitted: Sunday, July 8 at 5 49 PM ) What is the maximum acceleration the truck can have before the box begins to slide? 8.624 Your submiss 8.624 Computed value: 8.624 feedback: Correct! Submitted: Sunday, July 8 at 5:52 PM 4 Now the acceleration of the truck remains at that value, and the box begins to slide. What is the acceleration of the box?

Explanation / Answer

4. In this case, the applied force is equal to the frictional force. In such a situation only two events can happen- either the box is at rest or moving in uniform velocity. In question, it is mentioned that the box starts to slide. It means that the box will move in a constant velocity. In other words, the acceleration of the box will be ZERO.

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