This question involves the concepts of the law of conservation of momentum and speed.
She moves with a speed of "0.41 m/s".
Applying the law of conservation of momentum to this situation, we get:
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
where,
m₁ = mass of shirley = 65 kg
m₂ = mass of tank = 12 kg
u₁ = initial speed of shirley = 0 m/s
u₂ = initial speed of tank = 0 m/s
v₁ = final speed of shirley = ?
v₂ = final speed of tank = 2.2 m/s
Therefore,
[tex](65\ kg)(0\ m/s)+(12\ kg)(0\ m/s)=(65\ kg)(v_1)+(12\ kg)(2.2\ m/s)\\\\v_1=\frac{-26.4\ kg.m/s}{65\ kg}\\\\v_1=-0.41\ m/s[/tex]
negative sign shows the opposite direction.
Learn more about the law of conservation of momentum here:
brainly.com/question/1113396?referrer=searchResults
