試題詳解

1.Dagwood and Blondie are driving two identical cars. Blondie is passing Dagwood at twice his speed. They apply their brakes with equal constant force and stop on the level road. Dagwood travels a distance D in a time T while braking. How long does Blondie take to stop?
(A)T
(B)1.4T
(C)2T
(D)2.8T
(E)4T.