11.A river is moving east at 3 m/s. A boat starts from the dock heading 28° north of west at 5 m/s. If the
river is 2,300 m wide, answer the following.
What is the velocity of the boat with respect to Earth? (Enter the magnitude in m/s and the direction in degrees west of north.)
magnitude m/sdirection ° west of north
How long (in min) does it take the boat to cross the river?
12.John and Mary are skating at an ice rink. John skates at a constant speed of 6.8 m/s, with respect to the ice surface, directly south. Mary skates at a constant speed of 10.7 m/s in a direction of 26° west of south, with respect to the ice. What are the magnitude and direction of Mary's velocity with respect to John? Give the direction as measured relative to due south.magnitude m/sdirection ° west of south