Question
Question: A astronauts Mr. X and Mr. Y float in gravity zero space with no relative velocity to one another. M...
A astronauts Mr. X and Mr. Y float in gravity zero space with no relative velocity to one another. Mr. Y throws a mass of 5 kg towards X with speed 2 ms-1. If Mr. X catches it the changes in velocity of X and Y are

A
0.21 ms-1, 0.80 ms-1
B
0.80 ms-1, 0.21 ms-1
C
0.12 ms-1, 0.08 ms-1
D
0.08 ms-1, 0.12 ms-1
Answer
0.08 ms-1, 0.12 ms-1
Explanation
Solution
Using conservation of momentum,
(120 + 5)vx = 5 × 2
or vx = 12510 = 0.08ms-1
Also (90 - 5)vy = 5 × 2
or vy =8510 =0.12 ms-1