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

Magnitude of Net Force

  • Thread starter LCB
  • Start date
  • #1
LCB
3
0
When a 58 g tennis ball is served, it accelerates from rest to a constant speed of 49 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 45 cm. What is the magnitude of the net force acting on the ball?

I tried using Fnet=ma, but acceleration isn't given. So I tried to find acceleration by dividing the velocity by time, but time isn't given. Then I tried to use a kinematic formula without time in it to solve for acceleration. When I got my "answer", it wasn't right. What in the world am I doing wrong?
 

Answers and Replies

  • #2
StatusX
Homework Helper
2,564
1
How much work has the force done on the ball?
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,770
911
For any acceleration, starting from rest, v= at and s= (1/2)at2.

Here you are told that v= 49 m/s and s= 45 m/s2. You can solve those two equations for a and t. (Of course, you only need a.)
 

Related Threads for: Magnitude of Net Force

  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
8
Views
1K
  • Last Post
Replies
7
Views
24K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
2
Views
952
  • Last Post
Replies
1
Views
9K
  • Last Post
Replies
3
Views
562
  • Last Post
Replies
1
Views
1K
Top