Physics 011
Chapter 2
Answers of PQ#2



1. 

At t = 0 s See Section 28 in Giancoli 




2. 

At t = 0 s See Section 28 in Giancoli. 




3. 

At t = 0 s 




4. 

At t = 10 s 




5. 

During the first 8 s 




6. 

During the first 8 s The slopes are the same. Review Section 28 in Giancoli. 




7. 

Based on all the graphical information Review Section 25 in Giancoli. 




8. 

Which
graph represents an object at rest? 




9. 

Which
graph represents constant positive acceleration? This slope is zero. Review Section 25 in Giancoli. 




10. 

How is
motion in the negative x direction represented on an x vs. t plot? Velocity is the slope of the curve. Review Section 28 in Giancoli. 




11. 

What is
the meaning of a horizontal line on a plot of v vs. t? See Section 28 in Giancoli. 




12. 

If a car
accelerates from rest in the positive direction If it is accelerating its final speed is greater than its initial speed. Review Section 25 in Giancoli. 




13. 

A car
accelerating from rest at 2.0 m/s^2 for 5 s Review Section 25 in Giancoli. 




14. 

In this
problem "up" is taken to be positive. A ball is dropped off a high cliff 




15. 

In this
problem "up" is taken to be positive. A ball is thrown straight up in the air, at the very top its The velocity must be zero at the top. See Example 214 in Giancoli. 




16. 

In this
problem "up" is taken to be positive. A vertically upward thrown rock has a 




17. 

In this
problem "up" is taken to be positive. A falling object has See example 214 in Giancoli. 




18. 

In this
problem "up" is taken to be positive. An object moving upward under the influence of gravity has See example 214 in Giancoli. 




19. 

In this
problem "up" is taken to be positive. A ball thrown vertically upward with an initial velocity of 19.6 m/s,
after 5 s has a final velocity of Review Section 27 in Giancoli. 




20. 

An object
is shot upward at 34.3 m/s. How high does it go? 




21. 

Ball A is thrown
vertically upward with a speed of 19.6 m/s from the top edge of a high
building. As it passes the edge on the way down, a second ball, B, is thrown
downward at 19.6 m/s. Which of the following is correct? See Example 215 in Giancoli. 




22. 

A car
moving right to left applies the brakes. Its Since it is moving to the left its velocity must be negative. Review Section 26 in Giancoli. 




23. 

A ball is
dropped off a ledge. How far does it fall in the 2nd second? That is how far it falls in 1 second. Review Section 27 in Giancoli. 




24. 

Ball A is
thrown upward at the same time as ball B and with half the speed of ball B.
Which of the following is true? Review Example 213 in Giancoli. 




25. 

Ball A is
thrown upward at the same time as ball B and with half the speed of ball B.
How much higher does B go than A? See example 213 in Gian 
