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Question 4

Two identical boats are crossing two rivers of the same width. In one river a current is flowing while in the other there is no current. Both boats have the same motors and leave at the same time.

Which boat gets to the other side first?

(a) The one crossing the river without a current flowing.

(b) The one crossing the river with a current flowing.

(c) Both boats get to the other side at the same time.

Average: = 39%

Comment:

The knowledge to be applied is superposition of velocities. But transfer is needed from some arrows on a blackboard to a situation in the real world.

2/3 of our students can't do so.