John was swimming in the river. His swimming velocity was 1.2m/s due east. The water was running at 0.4 m/s due west. John’sprojected area in the water was 0.45 m2. Water density was 1000kg/m3. The coefficient of drag was 0.2. (a) What was John’svelocity relative to the water? (b) What was the pressure dragforce from the water? After a little while, John turned around andnow is swimming at 1.2 m/s due west. (c) What is John’s velocityrelative to the water now? (d) What is the pressure drag force fromthe water now? (e) What is the percentage of change in pressuredrag force?
