Physics 11, kinetic energy problem

  • Thread starter Iceclover
  • Start date
  • #1
59
0
Hey if anyone could help me work through a couple of problems that would be great!:smile:

Homework Statement



It is not uncommon during the service of a professional tennis player for the racquet to exert an everage force of 150.0N on the ball. If the ball has a mass of 0.060kg and is in contact with the strings of the racquet for 0.030s what is the kinetic energy of the ball as it leaves the racquet? Assume the ball starts from rest


Homework Equations



Ek=1/2mv^2

The Attempt at a Solution


I'm not sure really where to start here....
 

Answers and Replies

  • #2
radou
Homework Helper
3,115
6
A hint: impulse.
 
  • #3
486
1
Well, you know what you'll need to find Kinetic Energy--mass and velocity. You're given mass. Can you think of any other equations that might help you find velocity?
 
  • #4
59
0
what do i do once i've figured that out?
 
  • #5
59
0
d=vt but i don't have a distance either
 
  • #6
486
1
Once you've figured what out?
 
  • #7
59
0
oh my god i think i got it, will someone let me know if i got it right, just let me work it out.
 
  • #8
radou
Homework Helper
3,115
6
There is no need to create so many posts. :wink:
 
  • #9
59
0
i got 169J
 
  • #10
486
1
Looks OK to me, whose brain is fried!
 
Last edited:
  • #11
cristo
Staff Emeritus
Science Advisor
8,107
73
  • #12
59
0
p=Ft
p=150(0.030)
p=4.5

p=mv
4.5=(0.06)(v)
v=75m/s

Ek=1/2m^2
Ek=1/2(0.060)(75^2)
Ek=169J
 
  • #13
59
0
Ok i have a couple of other question so if anyone wants to stick around and help...?
 

Related Threads on Physics 11, kinetic energy problem

  • Last Post
Replies
1
Views
3K
Replies
18
Views
6K
Replies
7
Views
2K
  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
7
Views
2K
Replies
1
Views
576
  • Last Post
Replies
15
Views
1K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
16
Views
5K
  • Last Post
Replies
1
Views
846
Top