[tex]\textbf{Use equation of momentum}[/tex]
[tex]p=mv[/tex]
[tex]\text{momentum\ =\ mass x velocity}[/tex]
[tex]\textbf{Substitute in the values}[/tex]
[tex]5000 \times 75 = 375,000 \text{\ kg\ km/hr}[/tex]
[tex]4200 \times 75 = 315,000 \text{\ kg\ km/hr}[/tex]
[tex]\textbf{The\ small\ sports\ car\ will\ have\ the\ most\ momentum.}[/tex]