Answer
$0.9 \frac{m}{s}$
Work Step by Step
We apply the conservation of momentum by letting $p_v$ and $p_c$ be the momentum of the Volkswagen and Cadillac, respectively.
$p_v=p_c$
We expand to the definition of momentum:
$m_vv_v=m_cv_c$
Since we are given
$m_c = 2000 kg$
$v_c = 0.45 \frac m s$ ( by conversion from mph to ms)
$m_v = 1000 kg$
We need to solve for $v_v$, the velocity of the Volkswagen:
$\frac{m_cv_c}{m_v}=v_v$
Substituting all the known values in, we get the final answer
$\frac{(2000 kg)(0.45 \frac m s)}{1000 kg} = \boxed{0.9 \frac m s}$
