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1. Homework Statement

1. While descending at a constant speed of 1.0 m/s, a scuba diver releases a cork, which

accelerates upward at 3.0 m/s2. What is the diver’s depth when the cork reaches the surface 2.0 s later?

2. A car with a velocity of 27 m/s slows down at a rate of - 8.5 m/s2 to a stop in a distance

of 43 m on a dry road. The same car traveling at 27 m/s slows down at a rate of -6.5 m/s2 to a stop on a wet road.

a. How much farther does the car travel on the wet road before coming to a stop?

b. What maximum car speed will allow the car traveling on the wet road to stop in a distance of 43 m?

3. A car traveling at 14 m/s encounters a patch of ice and takes 5.0 s to stop.

a. What is the car’s acceleration?

b. How far does it travel before stopping?

4. An accelerating lab cart passes through two photo gate timers 3.0 m apart in 4.2 s. The velocity of the cart at the second timer is 1.2 m/s.

a. What is the cart’s velocity at the first gate?

b. What is the acceleration?

2. Homework Equations

WE NEED TO USE ONE OF THESE EQUATIONS FOR THESE QUESTIONS

V= Vo + at

d = Vo t + ½ at2

V2 = Vo2 +2ad

d = ½ (V + Vo) t

g= -9.8 m/s2

3. The Attempt at a Solution

I am sorry. I really have no idea. I have been sick for quite some time and missed a lot of school time. Since we are on break, this was our assignment, I cannot ask the teacher for help.

If you can tell me which equation I need to use, I am sure that will help.