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Collisions of rocks in space

  • Thread starter syjxpatty
  • Start date
5
0
1. Homework Statement

In outer space a rock with mass 4 kg, and velocity < 4000, -2800, 3400 > m/s, struck a rock with mass 18 kg and velocity < 250, -290, 260 > m/s. After the collision, the 4 kg rock's velocity is < 3600, -2300, 3900 > m/s.
What is the final velocity of the 18 kg rock?

2. Homework Equations

Momentum Principle

pf = pi + Fnetdeltat

3. The Attempt at a Solution

Please help me if you can! Im pretty frustrated with this problem and I dont know why Im getting it wrong! I used the momentum principle, but it hasnt worked since this is a collision problem. Should I use that the final speed for the 18kg rock is v2f = 2(m/M)v1i

v2 being the final velocity of 18kg
v1 being the initial velocity of 4kg
 

Answers and Replies

Hi, Write the velocities in vector form. Like for 4 Kg rock, initial velocity will be

[tex]V_4=4000i-2800j+3400k[/tex]

Then apply

[tex]P_i=P_f[/tex]
 

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