2. Sonar is the term used when sound waves are used to navigate or detect objects underwater. Passive sonar is
listening for sounds made by other objects. Active sonar is
when sounds are emitted and echoes are detected. Which
type of sonar is shown above? Describe one way it is used.

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.