Please anyone help me dynamic quiz i need it for a test

[djmorfia]

http://www.filefreak.com/pfiles/38439/physics.JPG

need help on question 3 and 4

I don't understand what to do for those question can anyone show me an message below

 

[Astronuc]

In problem 3, one has a distance of 40 m in which to react then decelerate to a stop.

One knows the initial velocity 72 km/h (and one should convert to m/s) and a time of 0.6 s, during which some distance is traveled, d_reaction. The distance over which the car must decelerate is 40 m - d_reaction = d_stopping

One has to determine if the required deceleration exceeds the acceleration (or deceleration) associated with force of friction.

Reference for equations of motion
http://hyperphysics.phy-astr.gsu.edu/hbase/mot.html

For the pulley problem (or equivalent) -
http://hyperphysics.phy-astr.gsu.edu/hbase/hpul.html#c1

General problems for Newton's 2nd law -
http://hyperphysics.phy-astr.gsu.edu/hbase/N2st

 

[ogb p]

.

I suggest that you first try to understand the questions yourself by reviewing the material and concepts covered in the quiz. If you are still struggling, try reaching out to your classmates or instructor for clarification. Additionally, you can search online for resources or tutorials related to the specific topics of questions 3 and 4. It is important to actively engage in the learning process and seek help when needed in order to fully understand and perform well on the quiz. Good luck!