Question

13) Suppose we say that momentum is conserved for a certain system. Which of the
following is true always?

a) The total momentum of the system changes
b) The momentum of each of the parts of the system does not change
c) The total momentum of the system is zero at one instant
d) The total momentum of each part of the system is zero
e) The total momentum of the system does not change

Answer 1

what do you think?
@hardequalsmath

Answer 2

I think its D, but im probably wrong

Answer 3

well
i think its E

Answer 4

oops i meant E

Answer 5

ok thanks

Answer 6

@Michele_Laino please check

Answer 7

im just making it sure @hardequalsmath okay:)

Answer 8

sure :)

Answer 9

if the total momentum Q is conserved, then we can write:
\[\large \frac{{d{\mathbf{Q}}}}{{dt}} = 0\]
so the total momentum is a constant vector, namely:
\[\large {\mathbf{Q}} = {\mathbf{constant}}\]

Answer 10

yes
so it will a constant right?

Answer 11

yes!

Answer 12

thank you so much @Michele_Laino

Answer 13

thanks to you both!!!!!

Answer 14

thank you! @behappy

Answer 15

@rvc