A vehcile was stopped in two seconds by fully jamming the brakes. The skid marks measured 9.8 metre's. The average skid resistance coefficient will be-A-0.7B-0.5C-0.4D-0.25-B-0.5

B 0.5 t=2 sec S=9.8 m F=? Now w*f=(w*a)/g Hence, f=a/g. From v=u+at If v=0,then u= at, Now, v^2 u^2=2aS Puting above values a=2S/ t^2. Now with the help of given data a=4.9, hence f=4.9/9.81= 0.499= 0.5Answer.