Two balls move away from each other, both traveling at 7 m/s. one has a mass of 2 kg and the other has a mass of 3 kg

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

b would be the answer