Answer Happy

2. A swimmer has a swimming speed of 3.8 m/s in still water. When they head directly across a river, they end up travelling downstream at an angle of 72° to the shore. Include a labelled vector diagram for each part. (8 marks) a) What is the speed of the current? b) What heading would the swimmer need to have in order to reach a point directly across the river?
c) If the stream is 12 m wide, how long would a trip directly across the river take? 3. A bird takes 1.8 s to change its velocity from 2.5 m/s [25°S of E] to 3.1 m/s [18°N of EJ. Knowing that acceleration is a vector, describe in words the steps needed to determine the bird's average acceleration. Draw a vector diagram that would be used in the solution, but do NOT solve for the numeric value of the acceleration. (4 marks)