Take into account that the momentum is given by the following formula:
[tex]p=mv[/tex]where,
m: mass of the car = ?
v: speed = 12 m/s
p: momentum = 4800 kg*m/s
Solve the equation above for m, replace the values of p and v, and simplify:
[tex]m=\frac{p}{v}=\frac{4800kg\frac{m}{s}}{12\frac{m}{s}}=400kg[/tex]Hence, the mass of the car is 400 kg
