Shelly rolls ball A in the positive x direction with a velocity of 7.5 meters/second. It hits stationary ball B and they undergo elastic collision. The two balls have different masses. Which of the following statements is true?

Question

supie · Answer

There is not following statements.

Please post the choices.

umm · Answer

A. the sum of their x-momentums must equal zero

B. the sum of their y-momentums must equal zero

C. the sum of their x-velocities must equal zero

D. the sum of their y-velocities must equal zero

supie · Answer

Thanks you're a Wizard!

What do you think could be eliminated @jarguijo?

jarguijo · Answer

I don't know

supie · Answer

Ok well, A and C are incorrect.

supie · Answer

Because those are about X when it's about Y

So, what do you think is correct B or D?

jarguijo · Answer

Ill go with B

jarguijo · Answer

Cause we know their velocity

supie · Answer

B talks about the momentums yk that right?