# Physics

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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.

• Physics - ,

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

• Physics - ,

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