A swimmer travels from the south end to the north end of a 30.0 m pool in 15.0 s and makes the return trip to the starting position in 19.0 s. What is the average velocity for the second half of the swim?

Question

anonymous · Answer

The average velocity over some journey is equal to the displacement from the starting point, divided by the time taken. So, for the second half of the swim, the swimmer travels 30 m (the length of the pool) in a time period of 19 s. So the velocity is
$$v=\frac{ d }{ t }=\frac{ 30 m }{ 19 s }$$