Respostas

2014-07-23T18:22:25-03:00
1)5x15=75km/h
2)4000/800=5m/s
3)45---------35
X----------60
X=77,14km/h ou 21,42m/s
2014-07-23T18:28:02-03:00
A)5km=5000m

4min=240s

Vm=ΔS/ΔT

Vm= \frac{5000}{240}= 20,83m/s ou74,98km/h

b) Vm= \frac{4000}{800} =5m/s ou 18km/h

c)Vm= \frac{45000}{2100} =21,42m/s ou 77,14km/h