How to solve and what concepts should i apply?

to solve at first we should know the formula and what does density stand for and what does velocity stand for and etc.

explanation:

basic formula are

v= u + at

2as=v2-u2

s= ut+1/2 at2

f= ma

m1u1+m2u2 = m1v1+m2v2

a=f/m

a = v-u/t

mass of a/mass of b

density =mass / volume

pressure =force /area

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.

0.11 m/s and 0.28 m/s should be correct