A car of mass 1200 kg is moving on the road at the speed of 60 km/h.If the coefficient of friction is 38 and the normal force is 50 N, then how can I find the frictional force acting on it?

To find the frictional force acting we just need the value of coefficient of friction and the reaction force from the surface on which the body is moving.
For the given data, the mass of the car, m = 1200 kg
Coefficient of friction, μ = 38
$$\begin{gathered} \mathrm{Friction} \mathrm{force}, \mathrm{f}=\mathrm{\mu R} \\ \mathrm{where} \mathrm{R} \mathrm{is} \mathrm{the} \mathrm{reaction} \mathrm{force} \\ \mathrm{R}=\mathrm{mg}=1200\times 10=12000 \mathrm{N} \\ \mathrm{Friction} \mathrm{force}, \mathrm{f}=\mathrm{\mu R} = 38\times 12000=456000 \mathrm{N} \\ \mathrm{Note}: \mathrm{The} \mathrm{value} \mathrm{of} \mathrm{coefficient} \mathrm{of} \mathrm{friction} \mathrm{equals} \mathrm{to} 38 \mathrm{is} \mathrm{not} \mathrm{practically} \mathrm{possible} \mathrm{for} \mathrm{general} \mathrm{cases}. \end{gathered}$$