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Collision Questions

  • #1
1. Jamie and Adam fire a cannon with a mass of 1150 kg. As the 14.5 kg cannonball leaves the cannon, the cannon recoils with a velocity of 1.75 m/s. How fast does the cannonball fly?

2. A 45 kg cart rolls along a railroad track at 4.0 m/s. A dog running at 7.6 m/s to catch up with the cart jumps on the cart. After the dog jumps on the cart, the cart is moving at 6.0 m/s. What is the mass of the dog?




2. m1v1 + m2v2 = (m1+m2)Vf

m1v1 + m2v2 = m1v1 + m2v2

(m1 + m2)*Vi = m1v1 + m2v2




3. I'm not sure what equation to use...
 

Answers and Replies

  • #2
SammyS
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1. Jamie and Adam fire a cannon with a mass of 1150 kg. As the 14.5 kg cannonball leaves the cannon, the cannon recoils with a velocity of 1.75 m/s. How fast does the cannonball fly?

2. A 45 kg cart rolls along a railroad track at 4.0 m/s. A dog running at 7.6 m/s to catch up with the cart jumps on the cart. After the dog jumps on the cart, the cart is moving at 6.0 m/s. What is the mass of the dog?


2. m1v1 + m2v2 = (m1+m2)Vf

m1v1 + m2v2 = m1v1 + m2v2

(m1 + m2)*Vi = m1v1 + m2v2


3. I'm not sure what equation to use...
Do you know what principle those equations are based on ?
 
  • #3
Do you know what principle those equations are based on ?
Collision? I'm sorry, I'm not exactly sure what you're asking.
 
  • #4
SammyS
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Collision? I'm sorry, I'm not exactly sure what you're asking.
They're based on conservation of something .

Do you know what that something is?
 
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