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m=2kg
v=8m/s
d=70cm⇒R=35cm=0,35m
Ditanyakan:Ek total=?
Dijawab:
Ek tot=Ek translasi+Ek rotasi
=1/2mv²+1/2(1/2 mr²)ω² ⇒1/2 mr² karena silinder pejal
v=ω.R
ω=v/R
ω=8/0,35
ω=22,9 rad/s
Ek tot=1/2.2.8²+1/2.1/2.2.(0,35²).(22,9)²
Ek tot=64+1/4.64,2
Ek tot=80 J