I have an exam tomorrow and I need to know these questions:

1. Velocity measures all of the following EXCEPT:
a. the speed of an object
b. the total displacement of an object
c. the direction of an object's motion
d. the displacement for each time interval

2. A car travels down a road at a certain velocity, vcar. The driver slows down so that the car is traveling only half as fast as before. Which of the following is the correct expression for the resultant velocity?
A. 2vcar
B. 1/2 vcar
C. -1/2 vcar
D. -2vcar

3. Which of the following is the best cooridnate system to use to analyze the motion of a child riding a tricycle along a sidewalk?
a. x-axis: perpendicular to the ground; y-axis: up and down
b. x-axis: up and down; y-axis: parallel to the ground
c. x-axis: parallel to the ground; y-axis: perpendicular to the ground
d. x-axis: up and down; y-axis: perpendicular to the ground

4. Which of the following is the best coordinate system to use to analyze the motion of a car traveling northeast from one city to another?
a. positive x-axis pointing east; positive y-axis pointing south
b. positive x-axis pointing west; positive y-axis pointing south
c. positive x-axis pointing north; positive y-axis pointing south
d. positive x-axis pointing east; positive y-axis pointing north

Tell us what you think the correct answers are and why, and we will critique your thought process.

An automobile is traveling 65mph. its brakes decelerates at 6.0mps. how long will it take to stop the car?

1. The correct answer is d. the displacement for each time interval. Velocity measures the rate at which an object changes its position. It is a vector quantity that includes both the speed of an object, its direction of motion, and the total displacement of an object. Therefore, options a, b, and c are correct. However, option d is incorrect because velocity does not measure the displacement for each time interval specifically.

2. The correct answer is B. 1/2 vcar. The resultant velocity is the final velocity after the car slows down. Since the car is only traveling half as fast as before, the resultant velocity would be half of the initial velocity (vcar). Therefore, option B - 1/2 vcar is the correct expression.

3. The best coordinate system to use to analyze the motion of a child riding a tricycle along a sidewalk is option c. x-axis: parallel to the ground; y-axis: perpendicular to the ground. In this case, the child's motion is primarily along the sidewalk, which can be represented by the x-axis. The y-axis, perpendicular to the ground, can represent any vertical motion, such as going up or down a ramp or over obstacles. Therefore, option c is the most appropriate choice.

4. The best coordinate system to use to analyze the motion of a car traveling northeast from one city to another is option d. positive x-axis pointing east; positive y-axis pointing north. In this case, the positive x-axis should point east to represent the eastward motion of the car. The positive y-axis should point north to represent the northward direction. Therefore, option d is the best choice to represent the car's motion in the given scenario.

a car travels down a road at a certain velocity the driver slows down so that the car is traveling only a third as fast as before. what is the correct expression for the resultant velocity