A ball with a mass of #2 kg# is rolling at #9 m/s# and elastically collides with a resting ball with a mass of #1 kg#. What are the post-collision velocities of the balls?
2 Answers
No
No
the speed after collision of the two objects are see below fro explanation:
Explanation:
Because there are two unknown I am not sure how you able to solve the above without using, conservation of momentum and conservation of energy (elastic collision). The combination of the two yields 2 equation and 2 unknown which you then solve:
Conservation of "Momentum":
Let,
Conservation of energy (elastic collision):
We have 2 equations and 2 unknowns:
From (1) ==>
From (2) ==>
Insert
Using the quadratic formula:
The solution that make sense is 2.64 (explain why?)
Insert in (3) and solve
So the speed after collision of the two objects are:
Explanation: