if a 1100 lb motorcycle(w/2 passengers)is doing 40mph,how long will take to come to a complete stop?

Answer 1

Nobody knows because you did not give us the coefficient of friction between the tires and the road or the de-acceleration some other way.

Answer 2

if a 1100 lb motorcycle(w/2 passengers)is doing 40mph,how long will take to come to a complete stop? this is happening with a full brake lock up.skid!in a stright line.