If that car fully stopped without hit the front car, and assume friction coefficient is 1.0, then v[sup]2[/sup]=2*a*s=2*9.8*1.0*65=1274

So estimated speed v=35.7m/s = 128 km/hr.

The speed could be larger, if the coefficient is larger than 1 (normally, yes) and the front car gets hit from behind!