### Physics Problem Set#### Problem 3Two train cars are moving in the same direction down a track. The car in front has a mass of \(2400 \, \text{kg}\) and is moving at \(2.85 \, \frac{\text{m}}{\text{s}}\). The second car has a mass of \(3900 \, \text{kg}\) and is following at \(3.85 \, \frac{\text{m}}{\text{s}}\). When the cars collide, they latch together.**a. What type of collision is this?****b. How fast do they move after colliding?**#### Problem 4A \(0.110 \, \text{kg}\) tennis ball is approaching a tennis player at \(23 \, \frac{\text{m}}{\text{s}}\) when she hits the ball with her racket. She returns the ball with a velocity of \(26 \, \frac{\text{m}}{\text{s}}\) by applying a force of \(300 \, \text{N}\) to the ball.**a. What is the change in momentum for the ball?****b. How long are the ball and racket in contact with each other?**

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4. A 0.110 kg tennis ball is approaching a tennis player at 23 m when she hits the ball with her racket. She returns the ball with a velocity of 26 by applying a force of 300 N to the ball. 777 a. What is the change in momentum for the ball? b. How long are the ball and racket in contact with each other?

4. A 0.110 kg tennis ball is approaching a tennis player at 23 m when she hits the ball with her racket. She returns the ball with a velocity of 26 by applying a force of 300 N to the ball. 777 a. What is the change in momentum for the ball? b. How long are the ball and racket in contact with each other?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter10: Systems Of Particles And Conservation Of Momentum

Section: Chapter Questions

Problem 54PQ

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### Physics Problem Set

#### Problem 3

Two train cars are moving in the same direction down a track. The car in front has a mass of \(2400 \, \text{kg}\) and is moving at \(2.85 \, \frac{\text{m}}{\text{s}}\). The second car has a mass of \(3900 \, \text{kg}\) and is following at \(3.85 \, \frac{\text{m}}{\text{s}}\). When the cars collide, they latch together.

**a. What type of collision is this?**

**b. How fast do they move after colliding?**

#### Problem 4

A \(0.110 \, \text{kg}\) tennis ball is approaching a tennis player at \(23 \, \frac{\text{m}}{\text{s}}\) when she hits the ball with her racket. She returns the ball with a velocity of \(26 \, \frac{\text{m}}{\text{s}}\) by applying a force of \(300 \, \text{N}\) to the ball.

**a. What is the change in momentum for the ball?**

**b. How long are the ball and racket in contact with each other?**

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