Heidi and heather take a 30 minute walk eastward along a straight road to a store 2.0 km away. what is their average velocity in m/s?

Average velocity =

(distance and direction of their change in location)

divided by

(time for the change) .

Distance and direction of their change in location = 2.0 km east  (their "displacement")

Time for the change = 30 minutes

Average velocity = (2.0 km east) / (30 minutes)

Average velocity = (2/30) (km east/minute)

Average velocity = 0.067 km/min east

or

Average velocity = 4.0 km/hr east

Just to be difficult, the question specifies that the answer must be given in units of m/s.  Is no problema for nosotros:

Average velocity = (4.0 km-east/hour) x (1,000 m/km) x (1 hour/3600 sec)

Average velocity = (4 x 1,000 / 3,600) (km-east-meter-hr / hr-km-sec)

Average velocity = 1.111... m/s East

depends on what you mean by "group." for order, it would be coleoptera (beetles). for class, it would be insecta (insects). for phylum, it would be the arthropoda (animals with jointed exoskeletons).

explanation: