How fast is her racket moving immediately after the impact?

  • Thread starter Thread starter splac6996
  • Start date Start date
  • Tags Tags
    Impact
Click For Summary
SUMMARY

The discussion centers on calculating the final speed of a tennis racket after impact with a tennis ball using the conservation of momentum principle. A 1000 g racket swings at 10.00 m/s and strikes a 60 g tennis ball moving at 20.0 m/s, which rebounds at 40.0 m/s. The correct application of the conservation of momentum equation, M1(Vf)1 + M2(Vf)2 = M1(Vi)1 + M2(Vi)2, reveals that the final speed of the racket (Vf1) is 6.4 m/s, not 8.8 m/s as initially calculated. Proper attention to the signs of the velocities is crucial for accurate results.

PREREQUISITES
  • Understanding of conservation of momentum
  • Familiarity with basic physics concepts of mass and velocity
  • Ability to manipulate algebraic equations
  • Knowledge of vector direction in physics
NEXT STEPS
  • Review conservation of momentum in one-dimensional collisions
  • Study the effects of mass and velocity on momentum
  • Learn about elastic and inelastic collisions in physics
  • Practice problems involving momentum calculations with varying mass and velocity
USEFUL FOR

Physics students, educators, and anyone interested in understanding momentum in collision scenarios, particularly in sports physics applications.

splac6996
Messages
37
Reaction score
0
A tennis player swings her 1000 g racket with a speed of 10.00 . She hits a 60 g tennis ball that was approaching her at a speed of 20.0 . The ball rebounds at 40.0 .

How fast is her racket moving immediately after the impact? You can ignore the interaction of the racket with her hand for the brief duration of the collision.

I used the conservation of momentum equation below

M1(Vf)1+M2(Vf)2=M1(Vi)1+M2(Vi)2

after rearranging this for Vf1 which in this case is the final speed of the racket I get 8.8m/s.

I should get 6.4m/s. Can someone please help me with this.
 
Last edited:
Physics news on Phys.org
You have to get the signs of the velocities right.
 

Similar threads

What is the Initial Velocity of the Racket in a Momentum Word Problem?
  • · Replies 5 ·
Replies
5
Views
4K
Tennis Racket Dynamics: Impacts, Forces & Weight
  • · Replies 1 ·
Replies
1
Views
4K
Momentum problem involving collision of two objects.
  • · Replies 7 ·
Replies
7
Views
17K
Momentum Conservation in Tennis Ball Collision
  • · Replies 3 ·
Replies
3
Views
5K
Calculating Speed of Ball After Racket Strike
  • · Replies 2 ·
Replies
2
Views
7K
What Speed Does the Railway Carriage Achieve After an Inelastic Collision?
  • · Replies 9 ·
Replies
9
Views
2K
How Fast Was the Truck Moving Before the Collision?
  • · Replies 1 ·
Replies
1
Views
2K
How Does Friction Impact Post-Collision Speed in Inelastic Car Accidents?
  • · Replies 4 ·
Replies
4
Views
6K
Impulse Problem review, check out help
  • · Replies 8 ·
Replies
8
Views
2K
What is the speed of the block (+ bullet) system immediately after impact?
  • · Replies 3 ·
Replies
3
Views
2K