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

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hope this