Answer to Question #81811 in Physics for Crystal Fidely

Question

While driving on the freeway at 110 km/h, you pass a
truck whose total length you estimate at 25 m. (a) If it takes you, in the driver’s seat, 5.5 s to pass from the rear of the truck to its front, what is the truck’s speed relative to the road? (b) How far does the truck travel while you’re passing it?

Answer 1

a) The relative speed is
v-u=l/t
The truck’s speed relative to the road is
u=v-l/t=110/3.6-25/5.5=26 m/s.
b)
d=ut=(26)(5.5)=143 m.