alves1250 03/09/2013 M= 9.10^2kgd=120mt= 4sv= 120 ==> v = 30m/s 4Ec = m .v^2 2Ec = 900 .(30)^2 2Ec= 450.900Ec= 405.10^3 J
alves1250
M= 9.10^2kg
d=120m
t= 4s
v= 120 ==> v = 30m/s
4
Ec = m .v^2
2
Ec = 900 .(30)^2
2
Ec= 450.900
Ec= 405.10^3 J