V SECTION 2 FORMATIVE ASSESSMENT Reviewing Main Ideas 1. Identify a convenient coordinate system for analyzing each of the following situations: a. a dog walking along a sidewalk b. an acrobat walking along a high wire c. a submarine submerging at an angle of 30 to the horizontal 2. Find the magnitude and direction of the resultant velocity vector for the following perpendicular velocities: a. a fish swimming at 3.0 m/s relative to the water across a river that moves at 5.0 m/s b. a surfer traveling at 1.0 m/s relative to the water across a wave that is traveling at 6.0 m/s 3. Find the vector components along the directions noted in parentheses. a. a car displaced 45 north of east by 10.0 km (north and east) b. a duck accelerating away from a hunter at 2.0 m/s2 at an angle of 35 to the ground (horizontal and vertical)