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Ek=1/2m v^2
A.dik
Ek=30.000 joule =30 kilojoule
v=72km/jam
maka massanya ?
30000=1/2 m. 72^2
72^2.m= 30000.2
5184m=60000
m=11,57
B
m=50kg
ek=625joule
maka v ?
625=1/2.50.v^2
v^2.50=625.2
v^2=25
v=5