Top Posters
Since Sunday
Home Q & A Board Science-Related Homework Help Physics
New Topic  
klcarrasquillo klcarrasquillo
wrote...
Go to Answer
Posts: 325
Rep: 0 0
5 years ago
A racing car accelerates uniformly from rest along a straight track.  This track has markers spaced at equal distances along it from the start, as shown in Figure 2.2.  The car reaches a speed of 140 km/h as it passes marker 2.

Figure 2.2




Whereabouts on the track was the car when it was travelling at half this speed, i.e. at 70 km/h?

• At marker 1

• Between marker 1 and marker 2

• Before marker 1
Textbook 
College Physics

College Physics


Edition: 10th
Authors:
Read 1094 times
4 Replies
Replies
Answer verified by a subject expert
kelsey9kelsey9
wrote...
#1
Posts: 190
Rep: 174 0
5 years ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here

Related Topics

wrote...
#2
2 years ago
tk
wrote...
#3
2 years ago
V1i = 0

Vf1 = 140 km/hr

Now

Vf1^2 = V1i^2 + 2ax1

140^2 = 0 + 2*a*x1 =========> a = 9800/x1

Then for V2 find x

Vf2 = 70 km/hr

Vi2 = 0

70^2 = 0 + 2*a*x2 =======> 70^2 = 2*(9800/x1)*x2

x2 = 0.25*x1

So, car will be before marker 1
wrote...
#4
2 years ago Edited: 2 years ago, bio_man
thanks
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1239 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Related Images
  
 185
  
 1063
  
 244