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

Collision in 2 dimensions (Momentum)

  • Thread starter MattsVai
  • Start date
37
0
1. Homework Statement
Two spacecrafts have linked in space and are coasting with their engines off, heading directly towards Mars. The spacecrafts are thrust apart by large springs. Spacecraft 1 with mass of 1.9 x 10^4 kg, then has a velocity of 3.5 x 10^3 km/h at 5.1 degrees to its original direction. Spacecraft 2 with mass 1.7 x 10^4 kg, has then a velocity of 3.4 x 10^3 km/h at 5.9 degrees to its original direction. Determine the original speed of the two craft when they were linked together.



2. The attempt at a solution
Please see attached my attempt to solve this question. Am I on the right path? Do I have to calculate for Y axis too? Many thanks
 

Attachments

Last edited:

Answers and Replies

37
0
Update:

So Basically, I know now that the force of the spring is in fact internal. But, if there is no velocity on the y axis why would I have to calculate it? And I on the right path performing calculations for the x axis only?

Cheers
 
225
0
You are indeed. The work done by the spring only acts in a Y direction so because of that, there is no change in speed in the x direction.
 
37
0
awesomeness.... thank you
 
81
0
From looking at your work, you forgot to convert the speeds from Km/h into m/s before plugging the numbers into the equation.
 

Related Threads for: Collision in 2 dimensions (Momentum)

Replies
1
Views
2K
  • Last Post
Replies
13
Views
3K
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
8
Views
2K
Replies
1
Views
1K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
1
Views
4K
Top