91影视

We need to find the mass of water that collected in the car.

Because of isolated system the railway is frictionless. The object has mass $m$and moves with speed $v$that has momentum $p$, Vector is a product of object's mass and its velocity.The momentum is given by equation in the form

role="math" localid="1649868600557" $p=mv$

Using expression $p$into equation $\left(1\right)$

$m_f{v}_f=m_i{v}_i\left(2\right)$

$m_i=5000kg$is the mass of train before raining and it becomes $m_f$ after raining. Putting values for $m_i,v_{i}and{v}_{f}toget{m}_f$We have to solve equation $\left(2\right)$for $m_f$

$$\begin{gathered} m_f=\frac{m_i{v}_i}{v_f} \\ =\frac{\left(5000kg\right)\left(22m/s\right)}{\left(20m/s\right)} \\ =5500kg \end{gathered}$$

To get mass of the water in the car by

$$\begin{gathered} m_{water}=m_f-m_i \\ =5500kg-5000kg \\ =500kg \end{gathered}$$