7 Two people are in a boat that is capable of a maximum speed of 5 kilometers per…
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics
Problem
7 Two people are in a boat that is capable of a maximum speed of 5 kilometers per hour in still water, and wish to cross a river 1 kilometer wide to a point directly across from their starting point. If the speed of the water in the river is 5 kilometers per hour, how much time is required for the crossing?
(A) 0.05 hr
(B) 0.1 hr
(C) 1 hr
(D) 10 hr
(E) The point directly across from the starting point cannot be reached under these conditions.