Final Physics

[ImagineDragons]

So how do I lay this last problem out?

Ball A, with a mass of 10kg, is moving to the right at 20 m/s. Ball B is moving to the left at 20 m/s. Upon collision, Ball B comes to a standstill, and Ball A moves to the left at twice its original speed. What is the mass of ball B?

[fiction-factory]

Don't you just use the principle of conservation of momentum (mass x velcocity). Rememeber to us epositive and negative values for velocity as it's a vector and has direction.
Try it and see what answer you get. We can then check it for you

[fiction-factory]

Hint- numbers are nice and easy so if you are needing a calculator you are doing it the wrong way. You mayw ant to write and solve an equation in which you use m as the mass of ball B

[fiction-factory]

I've just noticed that you asked two very similar ones last night and were given a step by step method and answer in one case and a method in the other from which you were able to work out the answer.
This problem is almost identical except the values are different. Just follow the same method