How much work? Given speeds and mass

  • Thread starter ital_dj
  • Start date
  • #1
31
0

Homework Statement


How much work is done by an Olympic triathlete who accelerates herself on her bicycle (combined mass of 105kg) from 5m/s to 10m/s


Homework Equations


W = mg[tex]\Delta[/tex]d


The Attempt at a Solution


Tried solving for d, and plugging in.
 

Answers and Replies

  • #2
458
0
Your equation would apply if there was gravitational energy involved, but in this question there isn't. Work here is defined as W = Fd where F = ma.
 
  • #3
31
0
But still, how would I solve for d?
 
  • #4
458
0
Use kinematics to solve for a and d simultaneously.
 
  • #5
19
0
W = delta(KE)

All you need to do is subtract her final kinetic energy from her initial kinetic energy to find the answer.
 

Related Threads on How much work? Given speeds and mass

Replies
18
Views
3K
Replies
11
Views
1K
  • Last Post
Replies
15
Views
3K
Replies
4
Views
10K
  • Last Post
Replies
1
Views
3K
Replies
1
Views
2K
  • Last Post
Replies
9
Views
564
  • Last Post
Replies
3
Views
1K
Replies
4
Views
771
Replies
2
Views
1K
Top