• Support PF! Buy your school textbooks, materials and every day products Here!

How to calculate average speed

  • Thread starter VICIOUSinc
  • Start date
  • #1

Homework Statement




An airport has runways only 174 m long. A
small plane must reach a ground speed of
42 m/s before it can become airborne.
What average acceleration must the plane’s
engines provide if it is to take off safely from
its airport?
Answer in units of m/s
2
.

Homework Equations



Average acceleration= change in velocity/change in time


The Attempt at a Solution


174/74=4.13m/s^2

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
1,860
0
No, I don't even know how you got that, though I'm sure your units must actually be wrong.

Use v^2=v0^2 + 2*a*d and solve for a.
 

Related Threads on How to calculate average speed

Replies
3
Views
1K
  • Last Post
Replies
3
Views
109K
  • Last Post
Replies
21
Views
10K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
5
Views
339
Replies
2
Views
936
  • Last Post
2
Replies
45
Views
2K
  • Last Post
Replies
1
Views
2K
Top