Respostas

2014-03-23T22:58:39-03:00
Vm = Δs / Δt
vm = 1 mi / 5min

a)

vm = 1 mi / 5min = 12 mi / 60min
============
vm = 12 mi/h
============

b)

vm = 12 mi / h = 12 . 1609 m/ h
vm = 19 308 m/h
ou

==================
vm = 19, 308 km/h
==================

c)

vm = 19 308 m/h
1h = 60 min = 3600s

vm = 19 308 / 3600
==============
vm = 5,363 m/s
==============